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Replace samples for C language

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This commit is contained in:
Sahil Dua
2016-06-26 05:14:45 +05:30
parent 49cdc4a930
commit aa32a5f58b
7 changed files with 291 additions and 1682 deletions
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45
samples/C/array.c Normal file
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@@ -0,0 +1,45 @@
#include <array.h>
unsigned __bump_up(unsigned n) {
unsigned base = 1;
--n;
while (base < sizeof n * 8) {
n |= n >> base;
base *= 2;
}
++n;
n += (n == 0);
return n;
}
void *__array_alloc(size_t size, unsigned length) {
unsigned allocated = __bump_up(length);
struct __array_header *head = malloc(sizeof *head + allocated * size);
assert(head);
head->length = length;
head->allocated = allocated;
return (void *) (head + 1);
}
void __array_resize(void **array, size_t size, int difference) {
if (difference == 0) {
return;
}
struct __array_header *head = __header(*array);
head->length += difference;
if (head->length >= head->allocated) {
head->allocated = __bump_up(head->length);
head = realloc(head, sizeof *head + head->allocated * size);
assert(head);
*array = head + 1;
}
}
int __array_search(void *array, void *elem, size_t size) {
for (unsigned i = 0; i < alength(array) * size; i += size) {
if (memcmp((char *)array + i, elem, size) == 0) {
return 1;
}
}
return 0;
}

58
samples/C/array.h Normal file
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#ifndef ARRAY_H
#define ARRAY_H value
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#define array(type, name, initial_length) \
type *name = __array_alloc(sizeof(type), initial_length)
#define aforeach(it, array) \
for (unsigned it = 0; \
it < alength(array); \
++it)
#define __header(array) \
((struct __array_header *) array - 1)
#define alength(array) \
(__header(array)->length)
#define afree(array) \
free(__header(array))
#define apush(array, elem) \
__array_resize((void **) &array, sizeof *array, 1); \
array[alength(array)-1] = elem
#define apop(array) \
aremove(array, (alength(array) - 1))
#define aremove(array, index) \
assert(alength(array) > index); \
memmove(array + index, array + index + 1, sizeof *array * (alength(array) - index - 1)); \
__array_resize((void **) &array, sizeof *array, -1)
#define ainsert(array, index, elem) \
__array_resize((void **) &array, sizeof *array, index >= alength(array) ? index - alength(array) + 1 : 1); \
memmove(array + index + 1, array + index, sizeof *array * (alength(array) - index - 1)); \
array[index] = elem
#define acontains(array, elem) \
__array_search(array, &elem, sizeof elem)
#define __arrayallocated(array) \
(__header(array)->allocated)
struct __array_header {
unsigned length;
unsigned allocated;
};
unsigned __bump_up(unsigned n);
void *__array_alloc(size_t size, unsigned length);
void __array_resize(void **array, size_t size, int difference);
int __array_search(void *array, void *elem, size_t size);
#endif /* ifndef ARRAY_H */

99
samples/C/cache.c
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@@ -1,99 +0,0 @@
/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "repository.h"
#include "commit.h"
#include "thread-utils.h"
#include "util.h"
#include "cache.h"
int git_cache_init(git_cache *cache, size_t size, git_cached_obj_freeptr free_ptr)
{
if (size < 8)
size = 8;
size = git__size_t_powerof2(size);
cache->size_mask = size - 1;
cache->lru_count = 0;
cache->free_obj = free_ptr;
git_mutex_init(&cache->lock);
cache->nodes = git__malloc(size * sizeof(git_cached_obj *));
GITERR_CHECK_ALLOC(cache->nodes);
memset(cache->nodes, 0x0, size * sizeof(git_cached_obj *));
return 0;
}
void git_cache_free(git_cache *cache)
{
size_t i;
for (i = 0; i < (cache->size_mask + 1); ++i) {
if (cache->nodes[i] != NULL)
git_cached_obj_decref(cache->nodes[i], cache->free_obj);
}
git__free(cache->nodes);
}
void *git_cache_get(git_cache *cache, const git_oid *oid)
{
uint32_t hash;
git_cached_obj *node = NULL, *result = NULL;
memcpy(&hash, oid->id, sizeof(hash));
git_mutex_lock(&cache->lock);
{
node = cache->nodes[hash & cache->size_mask];
if (node != NULL && git_oid_cmp(&node->oid, oid) == 0) {
git_cached_obj_incref(node);
result = node;
}
}
git_mutex_unlock(&cache->lock);
return result;
}
void *git_cache_try_store(git_cache *cache, void *_entry)
{
git_cached_obj *entry = _entry;
uint32_t hash;
memcpy(&hash, &entry->oid, sizeof(uint32_t));
/* increase the refcount on this object, because
* the cache now owns it */
git_cached_obj_incref(entry);
git_mutex_lock(&cache->lock);
{
git_cached_obj *node = cache->nodes[hash & cache->size_mask];
if (node == NULL) {
cache->nodes[hash & cache->size_mask] = entry;
} else if (git_oid_cmp(&node->oid, &entry->oid) == 0) {
git_cached_obj_decref(entry, cache->free_obj);
entry = node;
} else {
git_cached_obj_decref(node, cache->free_obj);
cache->nodes[hash & cache->size_mask] = entry;
}
}
git_mutex_unlock(&cache->lock);
/* increase the refcount again, because we are
* returning it to the user */
git_cached_obj_incref(entry);
return entry;
}

725
samples/C/cpu.c
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@@ -1,725 +0,0 @@
/* CPU control.
* (C) 2001, 2002, 2003, 2004 Rusty Russell
*
* This code is licenced under the GPL.
*/
#include <linux/proc_fs.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/cpu.h>
#include <linux/oom.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <linux/bug.h>
#include <linux/kthread.h>
#include <linux/stop_machine.h>
#include <linux/mutex.h>
#include <linux/gfp.h>
#include <linux/suspend.h>
#include "smpboot.h"
#ifdef CONFIG_SMP
/* Serializes the updates to cpu_online_mask, cpu_present_mask */
static DEFINE_MUTEX(cpu_add_remove_lock);
/*
* The following two API's must be used when attempting
* to serialize the updates to cpu_online_mask, cpu_present_mask.
*/
void cpu_maps_update_begin(void)
{
mutex_lock(&cpu_add_remove_lock);
}
void cpu_maps_update_done(void)
{
mutex_unlock(&cpu_add_remove_lock);
}
static RAW_NOTIFIER_HEAD(cpu_chain);
/* If set, cpu_up and cpu_down will return -EBUSY and do nothing.
* Should always be manipulated under cpu_add_remove_lock
*/
static int cpu_hotplug_disabled;
#ifdef CONFIG_HOTPLUG_CPU
static struct {
struct task_struct *active_writer;
struct mutex lock; /* Synchronizes accesses to refcount, */
/*
* Also blocks the new readers during
* an ongoing cpu hotplug operation.
*/
int refcount;
} cpu_hotplug = {
.active_writer = NULL,
.lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
.refcount = 0,
};
void get_online_cpus(void)
{
might_sleep();
if (cpu_hotplug.active_writer == current)
return;
mutex_lock(&cpu_hotplug.lock);
cpu_hotplug.refcount++;
mutex_unlock(&cpu_hotplug.lock);
}
EXPORT_SYMBOL_GPL(get_online_cpus);
void put_online_cpus(void)
{
if (cpu_hotplug.active_writer == current)
return;
mutex_lock(&cpu_hotplug.lock);
if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer))
wake_up_process(cpu_hotplug.active_writer);
mutex_unlock(&cpu_hotplug.lock);
}
EXPORT_SYMBOL_GPL(put_online_cpus);
/*
* This ensures that the hotplug operation can begin only when the
* refcount goes to zero.
*
* Note that during a cpu-hotplug operation, the new readers, if any,
* will be blocked by the cpu_hotplug.lock
*
* Since cpu_hotplug_begin() is always called after invoking
* cpu_maps_update_begin(), we can be sure that only one writer is active.
*
* Note that theoretically, there is a possibility of a livelock:
* - Refcount goes to zero, last reader wakes up the sleeping
* writer.
* - Last reader unlocks the cpu_hotplug.lock.
* - A new reader arrives at this moment, bumps up the refcount.
* - The writer acquires the cpu_hotplug.lock finds the refcount
* non zero and goes to sleep again.
*
* However, this is very difficult to achieve in practice since
* get_online_cpus() not an api which is called all that often.
*
*/
static void cpu_hotplug_begin(void)
{
cpu_hotplug.active_writer = current;
for (;;) {
mutex_lock(&cpu_hotplug.lock);
if (likely(!cpu_hotplug.refcount))
break;
__set_current_state(TASK_UNINTERRUPTIBLE);
mutex_unlock(&cpu_hotplug.lock);
schedule();
}
}
static void cpu_hotplug_done(void)
{
cpu_hotplug.active_writer = NULL;
mutex_unlock(&cpu_hotplug.lock);
}
#else /* #if CONFIG_HOTPLUG_CPU */
static void cpu_hotplug_begin(void) {}
static void cpu_hotplug_done(void) {}
#endif /* #else #if CONFIG_HOTPLUG_CPU */
/* Need to know about CPUs going up/down? */
int __ref register_cpu_notifier(struct notifier_block *nb)
{
int ret;
cpu_maps_update_begin();
ret = raw_notifier_chain_register(&cpu_chain, nb);
cpu_maps_update_done();
return ret;
}
static int __cpu_notify(unsigned long val, void *v, int nr_to_call,
int *nr_calls)
{
int ret;
ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call,
nr_calls);
return notifier_to_errno(ret);
}
static int cpu_notify(unsigned long val, void *v)
{
return __cpu_notify(val, v, -1, NULL);
}
#ifdef CONFIG_HOTPLUG_CPU
static void cpu_notify_nofail(unsigned long val, void *v)
{
BUG_ON(cpu_notify(val, v));
}
EXPORT_SYMBOL(register_cpu_notifier);
void __ref unregister_cpu_notifier(struct notifier_block *nb)
{
cpu_maps_update_begin();
raw_notifier_chain_unregister(&cpu_chain, nb);
cpu_maps_update_done();
}
EXPORT_SYMBOL(unregister_cpu_notifier);
/**
* clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU
* @cpu: a CPU id
*
* This function walks all processes, finds a valid mm struct for each one and
* then clears a corresponding bit in mm's cpumask. While this all sounds
* trivial, there are various non-obvious corner cases, which this function
* tries to solve in a safe manner.
*
* Also note that the function uses a somewhat relaxed locking scheme, so it may
* be called only for an already offlined CPU.
*/
void clear_tasks_mm_cpumask(int cpu)
{
struct task_struct *p;
/*
* This function is called after the cpu is taken down and marked
* offline, so its not like new tasks will ever get this cpu set in
* their mm mask. -- Peter Zijlstra
* Thus, we may use rcu_read_lock() here, instead of grabbing
* full-fledged tasklist_lock.
*/
WARN_ON(cpu_online(cpu));
rcu_read_lock();
for_each_process(p) {
struct task_struct *t;
/*
* Main thread might exit, but other threads may still have
* a valid mm. Find one.
*/
t = find_lock_task_mm(p);
if (!t)
continue;
cpumask_clear_cpu(cpu, mm_cpumask(t->mm));
task_unlock(t);
}
rcu_read_unlock();
}
static inline void check_for_tasks(int cpu)
{
struct task_struct *p;
write_lock_irq(&tasklist_lock);
for_each_process(p) {
if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
(p->utime || p->stime))
printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d "
"(state = %ld, flags = %x)\n",
p->comm, task_pid_nr(p), cpu,
p->state, p->flags);
}
write_unlock_irq(&tasklist_lock);
}
struct take_cpu_down_param {
unsigned long mod;
void *hcpu;
};
/* Take this CPU down. */
static int __ref take_cpu_down(void *_param)
{
struct take_cpu_down_param *param = _param;
int err;
/* Ensure this CPU doesn't handle any more interrupts. */
err = __cpu_disable();
if (err < 0)
return err;
cpu_notify(CPU_DYING | param->mod, param->hcpu);
return 0;
}
/* Requires cpu_add_remove_lock to be held */
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
{
int err, nr_calls = 0;
void *hcpu = (void *)(long)cpu;
unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
struct take_cpu_down_param tcd_param = {
.mod = mod,
.hcpu = hcpu,
};
if (num_online_cpus() == 1)
return -EBUSY;
if (!cpu_online(cpu))
return -EINVAL;
cpu_hotplug_begin();
err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
if (err) {
nr_calls--;
__cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
printk("%s: attempt to take down CPU %u failed\n",
__func__, cpu);
goto out_release;
}
err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
if (err) {
/* CPU didn't die: tell everyone. Can't complain. */
cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
goto out_release;
}
BUG_ON(cpu_online(cpu));
/*
* The migration_call() CPU_DYING callback will have removed all
* runnable tasks from the cpu, there's only the idle task left now
* that the migration thread is done doing the stop_machine thing.
*
* Wait for the stop thread to go away.
*/
while (!idle_cpu(cpu))
cpu_relax();
/* This actually kills the CPU. */
__cpu_die(cpu);
/* CPU is completely dead: tell everyone. Too late to complain. */
cpu_notify_nofail(CPU_DEAD | mod, hcpu);
check_for_tasks(cpu);
out_release:
cpu_hotplug_done();
if (!err)
cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
return err;
}
int __ref cpu_down(unsigned int cpu)
{
int err;
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
err = -EBUSY;
goto out;
}
err = _cpu_down(cpu, 0);
out:
cpu_maps_update_done();
return err;
}
EXPORT_SYMBOL(cpu_down);
#endif /*CONFIG_HOTPLUG_CPU*/
/* Requires cpu_add_remove_lock to be held */
static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
{
int ret, nr_calls = 0;
void *hcpu = (void *)(long)cpu;
unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
struct task_struct *idle;
if (cpu_online(cpu) || !cpu_present(cpu))
return -EINVAL;
cpu_hotplug_begin();
idle = idle_thread_get(cpu);
if (IS_ERR(idle)) {
ret = PTR_ERR(idle);
goto out;
}
ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
if (ret) {
nr_calls--;
printk(KERN_WARNING "%s: attempt to bring up CPU %u failed\n",
__func__, cpu);
goto out_notify;
}
/* Arch-specific enabling code. */
ret = __cpu_up(cpu, idle);
if (ret != 0)
goto out_notify;
BUG_ON(!cpu_online(cpu));
/* Now call notifier in preparation. */
cpu_notify(CPU_ONLINE | mod, hcpu);
out_notify:
if (ret != 0)
__cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
out:
cpu_hotplug_done();
return ret;
}
int __cpuinit cpu_up(unsigned int cpu)
{
int err = 0;
#ifdef CONFIG_MEMORY_HOTPLUG
int nid;
pg_data_t *pgdat;
#endif
if (!cpu_possible(cpu)) {
printk(KERN_ERR "can't online cpu %d because it is not "
"configured as may-hotadd at boot time\n", cpu);
#if defined(CONFIG_IA64)
printk(KERN_ERR "please check additional_cpus= boot "
"parameter\n");
#endif
return -EINVAL;
}
#ifdef CONFIG_MEMORY_HOTPLUG
nid = cpu_to_node(cpu);
if (!node_online(nid)) {
err = mem_online_node(nid);
if (err)
return err;
}
pgdat = NODE_DATA(nid);
if (!pgdat) {
printk(KERN_ERR
"Can't online cpu %d due to NULL pgdat\n", cpu);
return -ENOMEM;
}
if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
mutex_lock(&zonelists_mutex);
build_all_zonelists(NULL);
mutex_unlock(&zonelists_mutex);
}
#endif
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
err = -EBUSY;
goto out;
}
err = _cpu_up(cpu, 0);
out:
cpu_maps_update_done();
return err;
}
EXPORT_SYMBOL_GPL(cpu_up);
#ifdef CONFIG_PM_SLEEP_SMP
static cpumask_var_t frozen_cpus;
void __weak arch_disable_nonboot_cpus_begin(void)
{
}
void __weak arch_disable_nonboot_cpus_end(void)
{
}
int disable_nonboot_cpus(void)
{
int cpu, first_cpu, error = 0;
cpu_maps_update_begin();
first_cpu = cpumask_first(cpu_online_mask);
/*
* We take down all of the non-boot CPUs in one shot to avoid races
* with the userspace trying to use the CPU hotplug at the same time
*/
cpumask_clear(frozen_cpus);
arch_disable_nonboot_cpus_begin();
printk("Disabling non-boot CPUs ...\n");
for_each_online_cpu(cpu) {
if (cpu == first_cpu)
continue;
error = _cpu_down(cpu, 1);
if (!error)
cpumask_set_cpu(cpu, frozen_cpus);
else {
printk(KERN_ERR "Error taking CPU%d down: %d\n",
cpu, error);
break;
}
}
arch_disable_nonboot_cpus_end();
if (!error) {
BUG_ON(num_online_cpus() > 1);
/* Make sure the CPUs won't be enabled by someone else */
cpu_hotplug_disabled = 1;
} else {
printk(KERN_ERR "Non-boot CPUs are not disabled\n");
}
cpu_maps_update_done();
return error;
}
void __weak arch_enable_nonboot_cpus_begin(void)
{
}
void __weak arch_enable_nonboot_cpus_end(void)
{
}
void __ref enable_nonboot_cpus(void)
{
int cpu, error;
/* Allow everyone to use the CPU hotplug again */
cpu_maps_update_begin();
cpu_hotplug_disabled = 0;
if (cpumask_empty(frozen_cpus))
goto out;
printk(KERN_INFO "Enabling non-boot CPUs ...\n");
arch_enable_nonboot_cpus_begin();
for_each_cpu(cpu, frozen_cpus) {
error = _cpu_up(cpu, 1);
if (!error) {
printk(KERN_INFO "CPU%d is up\n", cpu);
continue;
}
printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
}
arch_enable_nonboot_cpus_end();
cpumask_clear(frozen_cpus);
out:
cpu_maps_update_done();
}
static int __init alloc_frozen_cpus(void)
{
if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO))
return -ENOMEM;
return 0;
}
core_initcall(alloc_frozen_cpus);
/*
* Prevent regular CPU hotplug from racing with the freezer, by disabling CPU
* hotplug when tasks are about to be frozen. Also, don't allow the freezer
* to continue until any currently running CPU hotplug operation gets
* completed.
* To modify the 'cpu_hotplug_disabled' flag, we need to acquire the
* 'cpu_add_remove_lock'. And this same lock is also taken by the regular
* CPU hotplug path and released only after it is complete. Thus, we
* (and hence the freezer) will block here until any currently running CPU
* hotplug operation gets completed.
*/
void cpu_hotplug_disable_before_freeze(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 1;
cpu_maps_update_done();
}
/*
* When tasks have been thawed, re-enable regular CPU hotplug (which had been
* disabled while beginning to freeze tasks).
*/
void cpu_hotplug_enable_after_thaw(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 0;
cpu_maps_update_done();
}
/*
* When callbacks for CPU hotplug notifications are being executed, we must
* ensure that the state of the system with respect to the tasks being frozen
* or not, as reported by the notification, remains unchanged *throughout the
* duration* of the execution of the callbacks.
* Hence we need to prevent the freezer from racing with regular CPU hotplug.
*
* This synchronization is implemented by mutually excluding regular CPU
* hotplug and Suspend/Hibernate call paths by hooking onto the Suspend/
* Hibernate notifications.
*/
static int
cpu_hotplug_pm_callback(struct notifier_block *nb,
unsigned long action, void *ptr)
{
switch (action) {
case PM_SUSPEND_PREPARE:
case PM_HIBERNATION_PREPARE:
cpu_hotplug_disable_before_freeze();
break;
case PM_POST_SUSPEND:
case PM_POST_HIBERNATION:
cpu_hotplug_enable_after_thaw();
break;
default:
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static int __init cpu_hotplug_pm_sync_init(void)
{
pm_notifier(cpu_hotplug_pm_callback, 0);
return 0;
}
core_initcall(cpu_hotplug_pm_sync_init);
#endif /* CONFIG_PM_SLEEP_SMP */
/**
* notify_cpu_starting(cpu) - call the CPU_STARTING notifiers
* @cpu: cpu that just started
*
* This function calls the cpu_chain notifiers with CPU_STARTING.
* It must be called by the arch code on the new cpu, before the new cpu
* enables interrupts and before the "boot" cpu returns from __cpu_up().
*/
void __cpuinit notify_cpu_starting(unsigned int cpu)
{
unsigned long val = CPU_STARTING;
#ifdef CONFIG_PM_SLEEP_SMP
if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus))
val = CPU_STARTING_FROZEN;
#endif /* CONFIG_PM_SLEEP_SMP */
cpu_notify(val, (void *)(long)cpu);
}
#endif /* CONFIG_SMP */
/*
* cpu_bit_bitmap[] is a special, "compressed" data structure that
* represents all NR_CPUS bits binary values of 1<<nr.
*
* It is used by cpumask_of() to get a constant address to a CPU
* mask value that has a single bit set only.
*/
/* cpu_bit_bitmap[0] is empty - so we can back into it */
#define MASK_DECLARE_1(x) [x+1][0] = (1UL << (x))
#define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1)
#define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2)
#define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4)
const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = {
MASK_DECLARE_8(0), MASK_DECLARE_8(8),
MASK_DECLARE_8(16), MASK_DECLARE_8(24),
#if BITS_PER_LONG > 32
MASK_DECLARE_8(32), MASK_DECLARE_8(40),
MASK_DECLARE_8(48), MASK_DECLARE_8(56),
#endif
};
EXPORT_SYMBOL_GPL(cpu_bit_bitmap);
const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL;
EXPORT_SYMBOL(cpu_all_bits);
#ifdef CONFIG_INIT_ALL_POSSIBLE
static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly
= CPU_BITS_ALL;
#else
static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly;
#endif
const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits);
EXPORT_SYMBOL(cpu_possible_mask);
static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly;
const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits);
EXPORT_SYMBOL(cpu_online_mask);
static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly;
const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits);
EXPORT_SYMBOL(cpu_present_mask);
static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly;
const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits);
EXPORT_SYMBOL(cpu_active_mask);
void set_cpu_possible(unsigned int cpu, bool possible)
{
if (possible)
cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits));
else
cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits));
}
void set_cpu_present(unsigned int cpu, bool present)
{
if (present)
cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits));
else
cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits));
}
void set_cpu_online(unsigned int cpu, bool online)
{
if (online)
cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits));
else
cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits));
}
void set_cpu_active(unsigned int cpu, bool active)
{
if (active)
cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits));
else
cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits));
}
void init_cpu_present(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_present_bits), src);
}
void init_cpu_possible(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_possible_bits), src);
}
void init_cpu_online(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_online_bits), src);
}

784
samples/C/diff.c
View File

@@ -1,784 +0,0 @@
/*
* Copyright (C) 2012 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "git2/diff.h"
#include "diff.h"
#include "fileops.h"
#include "config.h"
#include "attr_file.h"
static char *diff_prefix_from_pathspec(const git_strarray *pathspec)
{
git_buf prefix = GIT_BUF_INIT;
const char *scan;
if (git_buf_common_prefix(&prefix, pathspec) < 0)
return NULL;
/* diff prefix will only be leading non-wildcards */
for (scan = prefix.ptr; *scan && !git__iswildcard(*scan); ++scan);
git_buf_truncate(&prefix, scan - prefix.ptr);
if (prefix.size > 0)
return git_buf_detach(&prefix);
git_buf_free(&prefix);
return NULL;
}
static bool diff_pathspec_is_interesting(const git_strarray *pathspec)
{
const char *str;
if (pathspec == NULL || pathspec->count == 0)
return false;
if (pathspec->count > 1)
return true;
str = pathspec->strings[0];
if (!str || !str[0] || (!str[1] && (str[0] == '*' || str[0] == '.')))
return false;
return true;
}
static bool diff_path_matches_pathspec(git_diff_list *diff, const char *path)
{
unsigned int i;
git_attr_fnmatch *match;
if (!diff->pathspec.length)
return true;
git_vector_foreach(&diff->pathspec, i, match) {
int result = p_fnmatch(match->pattern, path, 0);
/* if we didn't match, look for exact dirname prefix match */
if (result == FNM_NOMATCH &&
(match->flags & GIT_ATTR_FNMATCH_HASWILD) == 0 &&
strncmp(path, match->pattern, match->length) == 0 &&
path[match->length] == '/')
result = 0;
if (result == 0)
return (match->flags & GIT_ATTR_FNMATCH_NEGATIVE) ? false : true;
}
return false;
}
static git_diff_delta *diff_delta__alloc(
git_diff_list *diff,
git_delta_t status,
const char *path)
{
git_diff_delta *delta = git__calloc(1, sizeof(git_diff_delta));
if (!delta)
return NULL;
delta->old_file.path = git_pool_strdup(&diff->pool, path);
if (delta->old_file.path == NULL) {
git__free(delta);
return NULL;
}
delta->new_file.path = delta->old_file.path;
if (diff->opts.flags & GIT_DIFF_REVERSE) {
switch (status) {
case GIT_DELTA_ADDED: status = GIT_DELTA_DELETED; break;
case GIT_DELTA_DELETED: status = GIT_DELTA_ADDED; break;
default: break; /* leave other status values alone */
}
}
delta->status = status;
return delta;
}
static git_diff_delta *diff_delta__dup(
const git_diff_delta *d, git_pool *pool)
{
git_diff_delta *delta = git__malloc(sizeof(git_diff_delta));
if (!delta)
return NULL;
memcpy(delta, d, sizeof(git_diff_delta));
delta->old_file.path = git_pool_strdup(pool, d->old_file.path);
if (delta->old_file.path == NULL)
goto fail;
if (d->new_file.path != d->old_file.path) {
delta->new_file.path = git_pool_strdup(pool, d->new_file.path);
if (delta->new_file.path == NULL)
goto fail;
} else {
delta->new_file.path = delta->old_file.path;
}
return delta;
fail:
git__free(delta);
return NULL;
}
static git_diff_delta *diff_delta__merge_like_cgit(
const git_diff_delta *a, const git_diff_delta *b, git_pool *pool)
{
git_diff_delta *dup = diff_delta__dup(a, pool);
if (!dup)
return NULL;
if (git_oid_cmp(&dup->new_file.oid, &b->new_file.oid) == 0)
return dup;
git_oid_cpy(&dup->new_file.oid, &b->new_file.oid);
dup->new_file.mode = b->new_file.mode;
dup->new_file.size = b->new_file.size;
dup->new_file.flags = b->new_file.flags;
/* Emulate C git for merging two diffs (a la 'git diff <sha>').
*
* When C git does a diff between the work dir and a tree, it actually
* diffs with the index but uses the workdir contents. This emulates
* those choices so we can emulate the type of diff.
*/
if (git_oid_cmp(&dup->old_file.oid, &dup->new_file.oid) == 0) {
if (dup->status == GIT_DELTA_DELETED)
/* preserve pending delete info */;
else if (b->status == GIT_DELTA_UNTRACKED ||
b->status == GIT_DELTA_IGNORED)
dup->status = b->status;
else
dup->status = GIT_DELTA_UNMODIFIED;
}
else if (dup->status == GIT_DELTA_UNMODIFIED ||
b->status == GIT_DELTA_DELETED)
dup->status = b->status;
return dup;
}
static int diff_delta__from_one(
git_diff_list *diff,
git_delta_t status,
const git_index_entry *entry)
{
git_diff_delta *delta;
if (status == GIT_DELTA_IGNORED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_IGNORED) == 0)
return 0;
if (status == GIT_DELTA_UNTRACKED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_UNTRACKED) == 0)
return 0;
if (!diff_path_matches_pathspec(diff, entry->path))
return 0;
delta = diff_delta__alloc(diff, status, entry->path);
GITERR_CHECK_ALLOC(delta);
/* This fn is just for single-sided diffs */
assert(status != GIT_DELTA_MODIFIED);
if (delta->status == GIT_DELTA_DELETED) {
delta->old_file.mode = entry->mode;
delta->old_file.size = entry->file_size;
git_oid_cpy(&delta->old_file.oid, &entry->oid);
} else /* ADDED, IGNORED, UNTRACKED */ {
delta->new_file.mode = entry->mode;
delta->new_file.size = entry->file_size;
git_oid_cpy(&delta->new_file.oid, &entry->oid);
}
delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
delta->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
if (git_vector_insert(&diff->deltas, delta) < 0) {
git__free(delta);
return -1;
}
return 0;
}
static int diff_delta__from_two(
git_diff_list *diff,
git_delta_t status,
const git_index_entry *old_entry,
const git_index_entry *new_entry,
git_oid *new_oid)
{
git_diff_delta *delta;
if (status == GIT_DELTA_UNMODIFIED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)
return 0;
if ((diff->opts.flags & GIT_DIFF_REVERSE) != 0) {
const git_index_entry *temp = old_entry;
old_entry = new_entry;
new_entry = temp;
}
delta = diff_delta__alloc(diff, status, old_entry->path);
GITERR_CHECK_ALLOC(delta);
delta->old_file.mode = old_entry->mode;
git_oid_cpy(&delta->old_file.oid, &old_entry->oid);
delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
delta->new_file.mode = new_entry->mode;
git_oid_cpy(&delta->new_file.oid, new_oid ? new_oid : &new_entry->oid);
if (new_oid || !git_oid_iszero(&new_entry->oid))
delta->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
if (git_vector_insert(&diff->deltas, delta) < 0) {
git__free(delta);
return -1;
}
return 0;
}
static char *diff_strdup_prefix(git_pool *pool, const char *prefix)
{
size_t len = strlen(prefix);
/* append '/' at end if needed */
if (len > 0 && prefix[len - 1] != '/')
return git_pool_strcat(pool, prefix, "/");
else
return git_pool_strndup(pool, prefix, len + 1);
}
static int diff_delta__cmp(const void *a, const void *b)
{
const git_diff_delta *da = a, *db = b;
int val = strcmp(da->old_file.path, db->old_file.path);
return val ? val : ((int)da->status - (int)db->status);
}
static int config_bool(git_config *cfg, const char *name, int defvalue)
{
int val = defvalue;
if (git_config_get_bool(&val, cfg, name) < 0)
giterr_clear();
return val;
}
static git_diff_list *git_diff_list_alloc(
git_repository *repo, const git_diff_options *opts)
{
git_config *cfg;
size_t i;
git_diff_list *diff = git__calloc(1, sizeof(git_diff_list));
if (diff == NULL)
return NULL;
diff->repo = repo;
if (git_vector_init(&diff->deltas, 0, diff_delta__cmp) < 0 ||
git_pool_init(&diff->pool, 1, 0) < 0)
goto fail;
/* load config values that affect diff behavior */
if (git_repository_config__weakptr(&cfg, repo) < 0)
goto fail;
if (config_bool(cfg, "core.symlinks", 1))
diff->diffcaps = diff->diffcaps | GIT_DIFFCAPS_HAS_SYMLINKS;
if (config_bool(cfg, "core.ignorestat", 0))
diff->diffcaps = diff->diffcaps | GIT_DIFFCAPS_ASSUME_UNCHANGED;
if (config_bool(cfg, "core.filemode", 1))
diff->diffcaps = diff->diffcaps | GIT_DIFFCAPS_TRUST_EXEC_BIT;
if (config_bool(cfg, "core.trustctime", 1))
diff->diffcaps = diff->diffcaps | GIT_DIFFCAPS_TRUST_CTIME;
/* Don't set GIT_DIFFCAPS_USE_DEV - compile time option in core git */
if (opts == NULL)
return diff;
memcpy(&diff->opts, opts, sizeof(git_diff_options));
memset(&diff->opts.pathspec, 0, sizeof(diff->opts.pathspec));
diff->opts.old_prefix = diff_strdup_prefix(&diff->pool,
opts->old_prefix ? opts->old_prefix : DIFF_OLD_PREFIX_DEFAULT);
diff->opts.new_prefix = diff_strdup_prefix(&diff->pool,
opts->new_prefix ? opts->new_prefix : DIFF_NEW_PREFIX_DEFAULT);
if (!diff->opts.old_prefix || !diff->opts.new_prefix)
goto fail;
if (diff->opts.flags & GIT_DIFF_REVERSE) {
char *swap = diff->opts.old_prefix;
diff->opts.old_prefix = diff->opts.new_prefix;
diff->opts.new_prefix = swap;
}
/* only copy pathspec if it is "interesting" so we can test
* diff->pathspec.length > 0 to know if it is worth calling
* fnmatch as we iterate.
*/
if (!diff_pathspec_is_interesting(&opts->pathspec))
return diff;
if (git_vector_init(
&diff->pathspec, (unsigned int)opts->pathspec.count, NULL) < 0)
goto fail;
for (i = 0; i < opts->pathspec.count; ++i) {
int ret;
const char *pattern = opts->pathspec.strings[i];
git_attr_fnmatch *match = git__calloc(1, sizeof(git_attr_fnmatch));
if (!match)
goto fail;
match->flags = GIT_ATTR_FNMATCH_ALLOWSPACE;
ret = git_attr_fnmatch__parse(match, &diff->pool, NULL, &pattern);
if (ret == GIT_ENOTFOUND) {
git__free(match);
continue;
} else if (ret < 0)
goto fail;
if (git_vector_insert(&diff->pathspec, match) < 0)
goto fail;
}
return diff;
fail:
git_diff_list_free(diff);
return NULL;
}
void git_diff_list_free(git_diff_list *diff)
{
git_diff_delta *delta;
git_attr_fnmatch *match;
unsigned int i;
if (!diff)
return;
git_vector_foreach(&diff->deltas, i, delta) {
git__free(delta);
diff->deltas.contents[i] = NULL;
}
git_vector_free(&diff->deltas);
git_vector_foreach(&diff->pathspec, i, match) {
git__free(match);
diff->pathspec.contents[i] = NULL;
}
git_vector_free(&diff->pathspec);
git_pool_clear(&diff->pool);
git__free(diff);
}
static int oid_for_workdir_item(
git_repository *repo,
const git_index_entry *item,
git_oid *oid)
{
int result;
git_buf full_path = GIT_BUF_INIT;
if (git_buf_joinpath(&full_path, git_repository_workdir(repo), item->path) < 0)
return -1;
/* calculate OID for file if possible*/
if (S_ISLNK(item->mode))
result = git_odb__hashlink(oid, full_path.ptr);
else if (!git__is_sizet(item->file_size)) {
giterr_set(GITERR_OS, "File size overflow for 32-bit systems");
result = -1;
} else {
int fd = git_futils_open_ro(full_path.ptr);
if (fd < 0)
result = fd;
else {
result = git_odb__hashfd(
oid, fd, (size_t)item->file_size, GIT_OBJ_BLOB);
p_close(fd);
}
}
git_buf_free(&full_path);
return result;
}
#define EXEC_BIT_MASK 0000111
static int maybe_modified(
git_iterator *old_iter,
const git_index_entry *oitem,
git_iterator *new_iter,
const git_index_entry *nitem,
git_diff_list *diff)
{
git_oid noid, *use_noid = NULL;
git_delta_t status = GIT_DELTA_MODIFIED;
unsigned int omode = oitem->mode;
unsigned int nmode = nitem->mode;
GIT_UNUSED(old_iter);
if (!diff_path_matches_pathspec(diff, oitem->path))
return 0;
/* on platforms with no symlinks, promote plain files to symlinks */
if (S_ISLNK(omode) && S_ISREG(nmode) &&
!(diff->diffcaps & GIT_DIFFCAPS_HAS_SYMLINKS))
nmode = GIT_MODE_TYPE(omode) | (nmode & GIT_MODE_PERMS_MASK);
/* on platforms with no execmode, clear exec bit from comparisons */
if (!(diff->diffcaps & GIT_DIFFCAPS_TRUST_EXEC_BIT)) {
omode = omode & ~EXEC_BIT_MASK;
nmode = nmode & ~EXEC_BIT_MASK;
}
/* support "assume unchanged" (badly, b/c we still stat everything) */
if ((diff->diffcaps & GIT_DIFFCAPS_ASSUME_UNCHANGED) != 0)
status = (oitem->flags_extended & GIT_IDXENTRY_INTENT_TO_ADD) ?
GIT_DELTA_MODIFIED : GIT_DELTA_UNMODIFIED;
/* support "skip worktree" index bit */
else if ((oitem->flags_extended & GIT_IDXENTRY_SKIP_WORKTREE) != 0)
status = GIT_DELTA_UNMODIFIED;
/* if basic type of file changed, then split into delete and add */
else if (GIT_MODE_TYPE(omode) != GIT_MODE_TYPE(nmode)) {
if (diff_delta__from_one(diff, GIT_DELTA_DELETED, oitem) < 0 ||
diff_delta__from_one(diff, GIT_DELTA_ADDED, nitem) < 0)
return -1;
return 0;
}
/* if oids and modes match, then file is unmodified */
else if (git_oid_cmp(&oitem->oid, &nitem->oid) == 0 &&
omode == nmode)
status = GIT_DELTA_UNMODIFIED;
/* if we have a workdir item with an unknown oid, check deeper */
else if (git_oid_iszero(&nitem->oid) && new_iter->type == GIT_ITERATOR_WORKDIR) {
/* TODO: add check against index file st_mtime to avoid racy-git */
/* if they files look exactly alike, then we'll assume the same */
if (oitem->file_size == nitem->file_size &&
(!(diff->diffcaps & GIT_DIFFCAPS_TRUST_CTIME) ||
(oitem->ctime.seconds == nitem->ctime.seconds)) &&
oitem->mtime.seconds == nitem->mtime.seconds &&
(!(diff->diffcaps & GIT_DIFFCAPS_USE_DEV) ||
(oitem->dev == nitem->dev)) &&
oitem->ino == nitem->ino &&
oitem->uid == nitem->uid &&
oitem->gid == nitem->gid)
status = GIT_DELTA_UNMODIFIED;
else if (S_ISGITLINK(nmode)) {
git_submodule *sub;
if ((diff->opts.flags & GIT_DIFF_IGNORE_SUBMODULES) != 0)
status = GIT_DELTA_UNMODIFIED;
else if (git_submodule_lookup(&sub, diff->repo, nitem->path) < 0)
return -1;
else if (sub->ignore == GIT_SUBMODULE_IGNORE_ALL)
status = GIT_DELTA_UNMODIFIED;
else {
/* TODO: support other GIT_SUBMODULE_IGNORE values */
status = GIT_DELTA_UNMODIFIED;
}
}
/* TODO: check git attributes so we will not have to read the file
* in if it is marked binary.
*/
else if (oid_for_workdir_item(diff->repo, nitem, &noid) < 0)
return -1;
else if (git_oid_cmp(&oitem->oid, &noid) == 0 &&
omode == nmode)
status = GIT_DELTA_UNMODIFIED;
/* store calculated oid so we don't have to recalc later */
use_noid = &noid;
}
return diff_delta__from_two(diff, status, oitem, nitem, use_noid);
}
static int diff_from_iterators(
git_repository *repo,
const git_diff_options *opts, /**< can be NULL for defaults */
git_iterator *old_iter,
git_iterator *new_iter,
git_diff_list **diff_ptr)
{
const git_index_entry *oitem, *nitem;
git_buf ignore_prefix = GIT_BUF_INIT;
git_diff_list *diff = git_diff_list_alloc(repo, opts);
if (!diff)
goto fail;
diff->old_src = old_iter->type;
diff->new_src = new_iter->type;
if (git_iterator_current(old_iter, &oitem) < 0 ||
git_iterator_current(new_iter, &nitem) < 0)
goto fail;
/* run iterators building diffs */
while (oitem || nitem) {
/* create DELETED records for old items not matched in new */
if (oitem && (!nitem || strcmp(oitem->path, nitem->path) < 0)) {
if (diff_delta__from_one(diff, GIT_DELTA_DELETED, oitem) < 0 ||
git_iterator_advance(old_iter, &oitem) < 0)
goto fail;
}
/* create ADDED, TRACKED, or IGNORED records for new items not
* matched in old (and/or descend into directories as needed)
*/
else if (nitem && (!oitem || strcmp(oitem->path, nitem->path) > 0)) {
git_delta_t delta_type = GIT_DELTA_UNTRACKED;
/* check if contained in ignored parent directory */
if (git_buf_len(&ignore_prefix) &&
git__prefixcmp(nitem->path, git_buf_cstr(&ignore_prefix)) == 0)
delta_type = GIT_DELTA_IGNORED;
if (S_ISDIR(nitem->mode)) {
/* recurse into directory only if there are tracked items in
* it or if the user requested the contents of untracked
* directories and it is not under an ignored directory.
*/
if ((oitem && git__prefixcmp(oitem->path, nitem->path) == 0) ||
(delta_type == GIT_DELTA_UNTRACKED &&
(diff->opts.flags & GIT_DIFF_RECURSE_UNTRACKED_DIRS) != 0))
{
/* if this directory is ignored, remember it as the
* "ignore_prefix" for processing contained items
*/
if (delta_type == GIT_DELTA_UNTRACKED &&
git_iterator_current_is_ignored(new_iter))
git_buf_sets(&ignore_prefix, nitem->path);
if (git_iterator_advance_into_directory(new_iter, &nitem) < 0)
goto fail;
continue;
}
}
/* In core git, the next two "else if" clauses are effectively
* reversed -- i.e. when an untracked file contained in an
* ignored directory is individually ignored, it shows up as an
* ignored file in the diff list, even though other untracked
* files in the same directory are skipped completely.
*
* To me, this is odd. If the directory is ignored and the file
* is untracked, we should skip it consistently, regardless of
* whether it happens to match a pattern in the ignore file.
*
* To match the core git behavior, just reverse the following
* two "else if" cases so that individual file ignores are
* checked before container directory exclusions are used to
* skip the file.
*/
else if (delta_type == GIT_DELTA_IGNORED) {
if (git_iterator_advance(new_iter, &nitem) < 0)
goto fail;
continue; /* ignored parent directory, so skip completely */
}
else if (git_iterator_current_is_ignored(new_iter))
delta_type = GIT_DELTA_IGNORED;
else if (new_iter->type != GIT_ITERATOR_WORKDIR)
delta_type = GIT_DELTA_ADDED;
if (diff_delta__from_one(diff, delta_type, nitem) < 0 ||
git_iterator_advance(new_iter, &nitem) < 0)
goto fail;
}
/* otherwise item paths match, so create MODIFIED record
* (or ADDED and DELETED pair if type changed)
*/
else {
assert(oitem && nitem && strcmp(oitem->path, nitem->path) == 0);
if (maybe_modified(old_iter, oitem, new_iter, nitem, diff) < 0 ||
git_iterator_advance(old_iter, &oitem) < 0 ||
git_iterator_advance(new_iter, &nitem) < 0)
goto fail;
}
}
git_iterator_free(old_iter);
git_iterator_free(new_iter);
git_buf_free(&ignore_prefix);
*diff_ptr = diff;
return 0;
fail:
git_iterator_free(old_iter);
git_iterator_free(new_iter);
git_buf_free(&ignore_prefix);
git_diff_list_free(diff);
*diff_ptr = NULL;
return -1;
}
int git_diff_tree_to_tree(
git_repository *repo,
const git_diff_options *opts, /**< can be NULL for defaults */
git_tree *old_tree,
git_tree *new_tree,
git_diff_list **diff)
{
git_iterator *a = NULL, *b = NULL;
char *prefix = opts ? diff_prefix_from_pathspec(&opts->pathspec) : NULL;
assert(repo && old_tree && new_tree && diff);
if (git_iterator_for_tree_range(&a, repo, old_tree, prefix, prefix) < 0 ||
git_iterator_for_tree_range(&b, repo, new_tree, prefix, prefix) < 0)
return -1;
git__free(prefix);
return diff_from_iterators(repo, opts, a, b, diff);
}
int git_diff_index_to_tree(
git_repository *repo,
const git_diff_options *opts,
git_tree *old_tree,
git_diff_list **diff)
{
git_iterator *a = NULL, *b = NULL;
char *prefix = opts ? diff_prefix_from_pathspec(&opts->pathspec) : NULL;
assert(repo && diff);
if (git_iterator_for_tree_range(&a, repo, old_tree, prefix, prefix) < 0 ||
git_iterator_for_index_range(&b, repo, prefix, prefix) < 0)
return -1;
git__free(prefix);
return diff_from_iterators(repo, opts, a, b, diff);
}
int git_diff_workdir_to_index(
git_repository *repo,
const git_diff_options *opts,
git_diff_list **diff)
{
git_iterator *a = NULL, *b = NULL;
char *prefix = opts ? diff_prefix_from_pathspec(&opts->pathspec) : NULL;
assert(repo && diff);
if (git_iterator_for_index_range(&a, repo, prefix, prefix) < 0 ||
git_iterator_for_workdir_range(&b, repo, prefix, prefix) < 0)
return -1;
git__free(prefix);
return diff_from_iterators(repo, opts, a, b, diff);
}
int git_diff_workdir_to_tree(
git_repository *repo,
const git_diff_options *opts,
git_tree *old_tree,
git_diff_list **diff)
{
git_iterator *a = NULL, *b = NULL;
char *prefix = opts ? diff_prefix_from_pathspec(&opts->pathspec) : NULL;
assert(repo && old_tree && diff);
if (git_iterator_for_tree_range(&a, repo, old_tree, prefix, prefix) < 0 ||
git_iterator_for_workdir_range(&b, repo, prefix, prefix) < 0)
return -1;
git__free(prefix);
return diff_from_iterators(repo, opts, a, b, diff);
}
int git_diff_merge(
git_diff_list *onto,
const git_diff_list *from)
{
int error = 0;
git_pool onto_pool;
git_vector onto_new;
git_diff_delta *delta;
unsigned int i, j;
assert(onto && from);
if (!from->deltas.length)
return 0;
if (git_vector_init(&onto_new, onto->deltas.length, diff_delta__cmp) < 0 ||
git_pool_init(&onto_pool, 1, 0) < 0)
return -1;
for (i = 0, j = 0; i < onto->deltas.length || j < from->deltas.length; ) {
git_diff_delta *o = GIT_VECTOR_GET(&onto->deltas, i);
const git_diff_delta *f = GIT_VECTOR_GET(&from->deltas, j);
int cmp = !f ? -1 : !o ? 1 : strcmp(o->old_file.path, f->old_file.path);
if (cmp < 0) {
delta = diff_delta__dup(o, &onto_pool);
i++;
} else if (cmp > 0) {
delta = diff_delta__dup(f, &onto_pool);
j++;
} else {
delta = diff_delta__merge_like_cgit(o, f, &onto_pool);
i++;
j++;
}
if ((error = !delta ? -1 : git_vector_insert(&onto_new, delta)) < 0)
break;
}
if (!error) {
git_vector_swap(&onto->deltas, &onto_new);
git_pool_swap(&onto->pool, &onto_pool);
onto->new_src = from->new_src;
}
git_vector_foreach(&onto_new, i, delta)
git__free(delta);
git_vector_free(&onto_new);
git_pool_clear(&onto_pool);
return error;
}

188
samples/C/fudge_node.c Normal file
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@@ -0,0 +1,188 @@
/* Copyright (c) 2010 Jens Nyberg
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE. */
#include <fudge.h>
#include <kernel.h>
#include <modules/system/system.h>
#include "pipe.h"
static struct system_node root;
static struct system_node clone;
static unsigned int read(struct pipe_end *endself, struct pipe_end *endtarget, struct service_state *state, unsigned int count, void *buffer)
{
count = buffer_rcfifo(&endself->buffer, count, buffer);
if (!count && endtarget->node.refcount)
{
list_add(&endself->readlinks, &state->link);
task_setstatus(state->link.data, TASK_STATUS_BLOCKED);
}
system_wakeup(&endtarget->writelinks);
return count;
}
static unsigned int write(struct pipe_end *endself, struct pipe_end *endtarget, struct service_state *state, unsigned int count, void *buffer)
{
count = buffer_wcfifo(&endtarget->buffer, count, buffer);
if (!count)
{
list_add(&endself->writelinks, &state->link);
task_setstatus(state->link.data, TASK_STATUS_BLOCKED);
}
system_wakeup(&endtarget->readlinks);
return count;
}
static unsigned int end0_read(struct system_node *self, struct service_state *state, unsigned int count, void *buffer)
{
struct pipe *pipe = (struct pipe *)self->parent;
return read(&pipe->end0, &pipe->end1, state, count, buffer);
}
static unsigned int end0_write(struct system_node *self, struct service_state *state, unsigned int count, void *buffer)
{
struct pipe *pipe = (struct pipe *)self->parent;
return write(&pipe->end0, &pipe->end1, state, count, buffer);
}
static unsigned int end1_read(struct system_node *self, struct service_state *state, unsigned int count, void *buffer)
{
struct pipe *pipe = (struct pipe *)self->parent;
return read(&pipe->end1, &pipe->end0, state, count, buffer);
}
static unsigned int end1_write(struct system_node *self, struct service_state *state, unsigned int count, void *buffer)
{
struct pipe *pipe = (struct pipe *)self->parent;
return write(&pipe->end1, &pipe->end0, state, count, buffer);
}
static unsigned int clone_child(struct system_node *self, unsigned int count, char *path)
{
struct list_item *current;
for (current = root.children.head; current; current = current->next)
{
struct system_node *node = current->data;
struct pipe *pipe = current->data;
if (node == self)
continue;
if (pipe->end0.node.refcount || pipe->end1.node.refcount)
continue;
return node->child(node, count, path);
}
return 0;
}
void pipe_init(struct pipe *pipe)
{
buffer_init(&pipe->end0.buffer, 4096, pipe->end0.data);
buffer_init(&pipe->end1.buffer, 4096, pipe->end1.data);
system_initnode(&pipe->end0.node, SYSTEM_NODETYPE_NORMAL, "0");
system_initnode(&pipe->end1.node, SYSTEM_NODETYPE_NORMAL, "1");
pipe->end0.node.read = end0_read;
pipe->end0.node.write = end0_write;
pipe->end1.node.read = end1_read;
pipe->end1.node.write = end1_write;
system_initnode(&pipe->root, SYSTEM_NODETYPE_GROUP | SYSTEM_NODETYPE_MULTI, "pipe");
system_addchild(&pipe->root, &pipe->end0.node);
system_addchild(&pipe->root, &pipe->end1.node);
}
void pipe_register(struct pipe *pipe)
{
system_addchild(&root, &pipe->root);
}
void pipe_unregister(struct pipe *pipe)
{
system_removechild(&root, &pipe->root);
}
void module_init(void)
{
system_initnode(&root, SYSTEM_NODETYPE_GROUP, "pipe");
system_initnode(&clone, SYSTEM_NODETYPE_GROUP, "clone");
clone.child = clone_child;
system_addchild(&root, &clone);
}
void module_register(void)
{
system_registernode(&root);
}
void module_unregister(void)
{
system_unregisternode(&root);
}

74
samples/C/hash.c
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@@ -1,74 +0,0 @@
/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "hash.h"
#if defined(PPC_SHA1)
# include "ppc/sha1.h"
#else
# include "sha1.h"
#endif
struct git_hash_ctx {
SHA_CTX c;
};
git_hash_ctx *git_hash_new_ctx(void)
{
git_hash_ctx *ctx = git__malloc(sizeof(*ctx));
if (!ctx)
return NULL;
SHA1_Init(&ctx->c);
return ctx;
}
void git_hash_free_ctx(git_hash_ctx *ctx)
{
git__free(ctx);
}
void git_hash_init(git_hash_ctx *ctx)
{
assert(ctx);
SHA1_Init(&ctx->c);
}
void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
{
assert(ctx);
SHA1_Update(&ctx->c, data, len);
}
void git_hash_final(git_oid *out, git_hash_ctx *ctx)
{
assert(ctx);
SHA1_Final(out->id, &ctx->c);
}
void git_hash_buf(git_oid *out, const void *data, size_t len)
{
SHA_CTX c;
SHA1_Init(&c);
SHA1_Update(&c, data, len);
SHA1_Final(out->id, &c);
}
void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
{
SHA_CTX c;
size_t i;
SHA1_Init(&c);
for (i = 0; i < n; i++)
SHA1_Update(&c, vec[i].data, vec[i].len);
SHA1_Final(out->id, &c);
}