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tag: v1.6.5
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/*
* Various trivial helper wrappers around standard functions
*/
#include "cache.h"

char *xstrdup(const char *str)
{
char *ret = strdup(str);
if (!ret) {
release_pack_memory(strlen(str) + 1, -1);
ret = strdup(str);
if (!ret)
die("Out of memory, strdup failed");
}
return ret;
}

void *xmalloc(size_t size)
{
void *ret = malloc(size);
if (!ret && !size)
ret = malloc(1);
if (!ret) {
release_pack_memory(size, -1);
ret = malloc(size);
if (!ret && !size)
ret = malloc(1);
if (!ret)
die("Out of memory, malloc failed");
}
#ifdef XMALLOC_POISON
memset(ret, 0xA5, size);
#endif
return ret;
}

/*
* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
* "data" to the allocated memory, zero terminates the allocated memory,
* and returns a pointer to the allocated memory. If the allocation fails,
* the program dies.
*/
void *xmemdupz(const void *data, size_t len)
{
char *p = xmalloc(len + 1);
memcpy(p, data, len);
p[len] = '\0';
return p;
}

char *xstrndup(const char *str, size_t len)
{
char *p = memchr(str, '\0', len);
return xmemdupz(str, p ? p - str : len);
}

void *xrealloc(void *ptr, size_t size)
{
void *ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
if (!ret) {
release_pack_memory(size, -1);
ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
if (!ret)
die("Out of memory, realloc failed");
}
return ret;
}

void *xcalloc(size_t nmemb, size_t size)
{
void *ret = calloc(nmemb, size);
if (!ret && (!nmemb || !size))
ret = calloc(1, 1);
if (!ret) {
release_pack_memory(nmemb * size, -1);
ret = calloc(nmemb, size);
if (!ret && (!nmemb || !size))
ret = calloc(1, 1);
if (!ret)
die("Out of memory, calloc failed");
}
return ret;
}

void *xmmap(void *start, size_t length,
int prot, int flags, int fd, off_t offset)
{
void *ret = mmap(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED) {
if (!length)
return NULL;
release_pack_memory(length, fd);
ret = mmap(start, length, prot, flags, fd, offset);
if (ret == MAP_FAILED)
die_errno("Out of memory? mmap failed");
}
return ret;
}

/*
* xread() is the same a read(), but it automatically restarts read()
* operations with a recoverable error (EAGAIN and EINTR). xread()
* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
*/
ssize_t xread(int fd, void *buf, size_t len)
{
ssize_t nr;
while (1) {
nr = read(fd, buf, len);
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
continue;
return nr;
}
}

/*
* xwrite() is the same a write(), but it automatically restarts write()
* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
* GUARANTEE that "len" bytes is written even if the operation is successful.
*/
ssize_t xwrite(int fd, const void *buf, size_t len)
{
ssize_t nr;
while (1) {
nr = write(fd, buf, len);
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
continue;
return nr;
}
}

ssize_t read_in_full(int fd, void *buf, size_t count)
{
char *p = buf;
ssize_t total = 0;

while (count > 0) {
ssize_t loaded = xread(fd, p, count);
if (loaded <= 0)
return total ? total : loaded;
count -= loaded;
p += loaded;
total += loaded;
}

return total;
}

ssize_t write_in_full(int fd, const void *buf, size_t count)
{
const char *p = buf;
ssize_t total = 0;

while (count > 0) {
ssize_t written = xwrite(fd, p, count);
if (written < 0)
return -1;
if (!written) {
errno = ENOSPC;
return -1;
}
count -= written;
p += written;
total += written;
}

return total;
}

int xdup(int fd)
{
int ret = dup(fd);
if (ret < 0)
die_errno("dup failed");
return ret;
}

FILE *xfdopen(int fd, const char *mode)
{
FILE *stream = fdopen(fd, mode);
if (stream == NULL)
die_errno("Out of memory? fdopen failed");
return stream;
}

int xmkstemp(char *template)
{
int fd;

fd = mkstemp(template);
if (fd < 0)
die_errno("Unable to create temporary file");
return fd;
}

/*
* zlib wrappers to make sure we don't silently miss errors
* at init time.
*/
void git_inflate_init(z_streamp strm)
{
const char *err;

switch (inflateInit(strm)) {
case Z_OK:
return;

case Z_MEM_ERROR:
err = "out of memory";
break;
case Z_VERSION_ERROR:
err = "wrong version";
break;
default:
err = "error";
}
die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message");
}

void git_inflate_end(z_streamp strm)
{
if (inflateEnd(strm) != Z_OK)
error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
}

int git_inflate(z_streamp strm, int flush)
{
int ret = inflate(strm, flush);
const char *err;

switch (ret) {
/* Out of memory is fatal. */
case Z_MEM_ERROR:
die("inflate: out of memory");

/* Data corruption errors: we may want to recover from them (fsck) */
case Z_NEED_DICT:
err = "needs dictionary"; break;
case Z_DATA_ERROR:
err = "data stream error"; break;
case Z_STREAM_ERROR:
err = "stream consistency error"; break;
default:
err = "unknown error"; break;

/* Z_BUF_ERROR: normal, needs more space in the output buffer */
case Z_BUF_ERROR:
case Z_OK:
case Z_STREAM_END:
return ret;
}
error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message");
return ret;
}

int odb_mkstemp(char *template, size_t limit, const char *pattern)
{
int fd;

snprintf(template, limit, "%s/%s",
get_object_directory(), pattern);
fd = mkstemp(template);
if (0 <= fd)
return fd;

/* slow path */
/* some mkstemp implementations erase template on failure */
snprintf(template, limit, "%s/%s",
get_object_directory(), pattern);
safe_create_leading_directories(template);
return xmkstemp(template);
}

int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
{
int fd;

snprintf(name, namesz, "%s/pack/pack-%s.keep",
get_object_directory(), sha1_to_hex(sha1));
fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
if (0 <= fd)
return fd;

/* slow path */
safe_create_leading_directories(name);
return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
}

int unlink_or_warn(const char *file)
{
int rc = unlink(file);

if (rc < 0) {
int err = errno;
if (ENOENT != err) {
warning("unable to unlink %s: %s",
file, strerror(errno));
errno = err;
}
}
return rc;
}
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