Squashed 'third_party/git/' content from commit cb71568594
git-subtree-dir: third_party/git git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7
This commit is contained in:
Vincent Ambo
commit
1b593e1ea4
3629 changed files with 1139935 additions and 0 deletions
705
wrapper.c
Normal file
705
wrapper.c
Normal file
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@ -0,0 +1,705 @@
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/*
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* Various trivial helper wrappers around standard functions
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*/
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#include "cache.h"
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#include "config.h"
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static void do_nothing(size_t size)
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{
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}
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static void (*try_to_free_routine)(size_t size) = do_nothing;
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static int memory_limit_check(size_t size, int gentle)
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{
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static size_t limit = 0;
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if (!limit) {
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limit = git_env_ulong("GIT_ALLOC_LIMIT", 0);
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if (!limit)
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limit = SIZE_MAX;
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}
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if (size > limit) {
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if (gentle) {
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error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
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(uintmax_t)size, (uintmax_t)limit);
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return -1;
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} else
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die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
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(uintmax_t)size, (uintmax_t)limit);
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}
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return 0;
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}
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try_to_free_t set_try_to_free_routine(try_to_free_t routine)
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{
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try_to_free_t old = try_to_free_routine;
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if (!routine)
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routine = do_nothing;
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try_to_free_routine = routine;
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return old;
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}
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char *xstrdup(const char *str)
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{
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char *ret = strdup(str);
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if (!ret) {
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try_to_free_routine(strlen(str) + 1);
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ret = strdup(str);
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if (!ret)
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die("Out of memory, strdup failed");
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}
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return ret;
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}
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static void *do_xmalloc(size_t size, int gentle)
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{
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void *ret;
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if (memory_limit_check(size, gentle))
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return NULL;
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ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret) {
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try_to_free_routine(size);
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ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret) {
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if (!gentle)
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die("Out of memory, malloc failed (tried to allocate %lu bytes)",
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(unsigned long)size);
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else {
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error("Out of memory, malloc failed (tried to allocate %lu bytes)",
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(unsigned long)size);
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return NULL;
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}
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}
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}
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#ifdef XMALLOC_POISON
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memset(ret, 0xA5, size);
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#endif
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return ret;
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}
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void *xmalloc(size_t size)
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{
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return do_xmalloc(size, 0);
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}
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static void *do_xmallocz(size_t size, int gentle)
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{
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void *ret;
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if (unsigned_add_overflows(size, 1)) {
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if (gentle) {
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error("Data too large to fit into virtual memory space.");
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return NULL;
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} else
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die("Data too large to fit into virtual memory space.");
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}
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ret = do_xmalloc(size + 1, gentle);
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if (ret)
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((char*)ret)[size] = 0;
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return ret;
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}
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void *xmallocz(size_t size)
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{
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return do_xmallocz(size, 0);
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}
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void *xmallocz_gently(size_t size)
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{
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return do_xmallocz(size, 1);
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}
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/*
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* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
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* "data" to the allocated memory, zero terminates the allocated memory,
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* and returns a pointer to the allocated memory. If the allocation fails,
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* the program dies.
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*/
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void *xmemdupz(const void *data, size_t len)
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{
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return memcpy(xmallocz(len), data, len);
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}
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char *xstrndup(const char *str, size_t len)
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{
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char *p = memchr(str, '\0', len);
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return xmemdupz(str, p ? p - str : len);
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}
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void *xrealloc(void *ptr, size_t size)
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{
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void *ret;
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memory_limit_check(size, 0);
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ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret) {
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try_to_free_routine(size);
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ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret)
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die("Out of memory, realloc failed");
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}
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return ret;
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}
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void *xcalloc(size_t nmemb, size_t size)
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{
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void *ret;
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if (unsigned_mult_overflows(nmemb, size))
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die("data too large to fit into virtual memory space");
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memory_limit_check(size * nmemb, 0);
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ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret) {
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try_to_free_routine(nmemb * size);
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ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret)
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die("Out of memory, calloc failed");
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}
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return ret;
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}
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/*
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* Limit size of IO chunks, because huge chunks only cause pain. OS X
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* 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in
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* the absence of bugs, large chunks can result in bad latencies when
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* you decide to kill the process.
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*
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* We pick 8 MiB as our default, but if the platform defines SSIZE_MAX
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* that is smaller than that, clip it to SSIZE_MAX, as a call to
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* read(2) or write(2) larger than that is allowed to fail. As the last
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* resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value"
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* to override this, if the definition of SSIZE_MAX given by the platform
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* is broken.
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*/
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#ifndef MAX_IO_SIZE
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# define MAX_IO_SIZE_DEFAULT (8*1024*1024)
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# if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT)
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# define MAX_IO_SIZE SSIZE_MAX
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# else
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# define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT
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# endif
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#endif
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/**
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* xopen() is the same as open(), but it die()s if the open() fails.
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*/
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int xopen(const char *path, int oflag, ...)
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{
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mode_t mode = 0;
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va_list ap;
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/*
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* va_arg() will have undefined behavior if the specified type is not
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* compatible with the argument type. Since integers are promoted to
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* ints, we fetch the next argument as an int, and then cast it to a
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* mode_t to avoid undefined behavior.
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*/
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va_start(ap, oflag);
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if (oflag & O_CREAT)
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mode = va_arg(ap, int);
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va_end(ap);
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for (;;) {
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int fd = open(path, oflag, mode);
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if (fd >= 0)
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return fd;
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if (errno == EINTR)
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continue;
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if ((oflag & O_RDWR) == O_RDWR)
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die_errno(_("could not open '%s' for reading and writing"), path);
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else if ((oflag & O_WRONLY) == O_WRONLY)
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die_errno(_("could not open '%s' for writing"), path);
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else
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die_errno(_("could not open '%s' for reading"), path);
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}
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}
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static int handle_nonblock(int fd, short poll_events, int err)
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{
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struct pollfd pfd;
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if (err != EAGAIN && err != EWOULDBLOCK)
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return 0;
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pfd.fd = fd;
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pfd.events = poll_events;
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/*
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* no need to check for errors, here;
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* a subsequent read/write will detect unrecoverable errors
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*/
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poll(&pfd, 1, -1);
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return 1;
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}
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/*
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* xread() is the same a read(), but it automatically restarts read()
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* operations with a recoverable error (EAGAIN and EINTR). xread()
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* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
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*/
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ssize_t xread(int fd, void *buf, size_t len)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = read(fd, buf, len);
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if (nr < 0) {
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if (errno == EINTR)
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continue;
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if (handle_nonblock(fd, POLLIN, errno))
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continue;
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}
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return nr;
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}
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}
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/*
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* xwrite() is the same a write(), but it automatically restarts write()
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* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
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* GUARANTEE that "len" bytes is written even if the operation is successful.
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*/
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ssize_t xwrite(int fd, const void *buf, size_t len)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = write(fd, buf, len);
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if (nr < 0) {
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if (errno == EINTR)
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continue;
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if (handle_nonblock(fd, POLLOUT, errno))
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continue;
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}
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return nr;
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}
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}
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/*
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* xpread() is the same as pread(), but it automatically restarts pread()
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* operations with a recoverable error (EAGAIN and EINTR). xpread() DOES
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* NOT GUARANTEE that "len" bytes is read even if the data is available.
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*/
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ssize_t xpread(int fd, void *buf, size_t len, off_t offset)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = pread(fd, buf, len, offset);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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ssize_t read_in_full(int fd, void *buf, size_t count)
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||||
{
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||||
char *p = buf;
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||||
ssize_t total = 0;
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while (count > 0) {
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ssize_t loaded = xread(fd, p, count);
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if (loaded < 0)
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return -1;
|
||||
if (loaded == 0)
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return total;
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count -= loaded;
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p += loaded;
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total += loaded;
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||||
}
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return total;
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||||
}
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||||
|
||||
ssize_t write_in_full(int fd, const void *buf, size_t count)
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||||
{
|
||||
const char *p = buf;
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ssize_t total = 0;
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|
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while (count > 0) {
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ssize_t written = xwrite(fd, p, count);
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if (written < 0)
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||||
return -1;
|
||||
if (!written) {
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errno = ENOSPC;
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return -1;
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||||
}
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count -= written;
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p += written;
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total += written;
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}
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||||
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return total;
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||||
}
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||||
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||||
ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset)
|
||||
{
|
||||
char *p = buf;
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||||
ssize_t total = 0;
|
||||
|
||||
while (count > 0) {
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ssize_t loaded = xpread(fd, p, count, offset);
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if (loaded < 0)
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return -1;
|
||||
if (loaded == 0)
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||||
return total;
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count -= loaded;
|
||||
p += loaded;
|
||||
total += loaded;
|
||||
offset += loaded;
|
||||
}
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
int xdup(int fd)
|
||||
{
|
||||
int ret = dup(fd);
|
||||
if (ret < 0)
|
||||
die_errno("dup failed");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* xfopen() is the same as fopen(), but it die()s if the fopen() fails.
|
||||
*/
|
||||
FILE *xfopen(const char *path, const char *mode)
|
||||
{
|
||||
for (;;) {
|
||||
FILE *fp = fopen(path, mode);
|
||||
if (fp)
|
||||
return fp;
|
||||
if (errno == EINTR)
|
||||
continue;
|
||||
|
||||
if (*mode && mode[1] == '+')
|
||||
die_errno(_("could not open '%s' for reading and writing"), path);
|
||||
else if (*mode == 'w' || *mode == 'a')
|
||||
die_errno(_("could not open '%s' for writing"), path);
|
||||
else
|
||||
die_errno(_("could not open '%s' for reading"), path);
|
||||
}
|
||||
}
|
||||
|
||||
FILE *xfdopen(int fd, const char *mode)
|
||||
{
|
||||
FILE *stream = fdopen(fd, mode);
|
||||
if (stream == NULL)
|
||||
die_errno("Out of memory? fdopen failed");
|
||||
return stream;
|
||||
}
|
||||
|
||||
FILE *fopen_for_writing(const char *path)
|
||||
{
|
||||
FILE *ret = fopen(path, "w");
|
||||
|
||||
if (!ret && errno == EPERM) {
|
||||
if (!unlink(path))
|
||||
ret = fopen(path, "w");
|
||||
else
|
||||
errno = EPERM;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void warn_on_inaccessible(const char *path)
|
||||
{
|
||||
warning_errno(_("unable to access '%s'"), path);
|
||||
}
|
||||
|
||||
int warn_on_fopen_errors(const char *path)
|
||||
{
|
||||
if (errno != ENOENT && errno != ENOTDIR) {
|
||||
warn_on_inaccessible(path);
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
FILE *fopen_or_warn(const char *path, const char *mode)
|
||||
{
|
||||
FILE *fp = fopen(path, mode);
|
||||
|
||||
if (fp)
|
||||
return fp;
|
||||
|
||||
warn_on_fopen_errors(path);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int xmkstemp(char *filename_template)
|
||||
{
|
||||
int fd;
|
||||
char origtemplate[PATH_MAX];
|
||||
strlcpy(origtemplate, filename_template, sizeof(origtemplate));
|
||||
|
||||
fd = mkstemp(filename_template);
|
||||
if (fd < 0) {
|
||||
int saved_errno = errno;
|
||||
const char *nonrelative_template;
|
||||
|
||||
if (strlen(filename_template) != strlen(origtemplate))
|
||||
filename_template = origtemplate;
|
||||
|
||||
nonrelative_template = absolute_path(filename_template);
|
||||
errno = saved_errno;
|
||||
die_errno("Unable to create temporary file '%s'",
|
||||
nonrelative_template);
|
||||
}
|
||||
return fd;
|
||||
}
|
||||
|
||||
/* Adapted from libiberty's mkstemp.c. */
|
||||
|
||||
#undef TMP_MAX
|
||||
#define TMP_MAX 16384
|
||||
|
||||
int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
|
||||
{
|
||||
static const char letters[] =
|
||||
"abcdefghijklmnopqrstuvwxyz"
|
||||
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
||||
"0123456789";
|
||||
static const int num_letters = 62;
|
||||
uint64_t value;
|
||||
struct timeval tv;
|
||||
char *filename_template;
|
||||
size_t len;
|
||||
int fd, count;
|
||||
|
||||
len = strlen(pattern);
|
||||
|
||||
if (len < 6 + suffix_len) {
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Replace pattern's XXXXXX characters with randomness.
|
||||
* Try TMP_MAX different filenames.
|
||||
*/
|
||||
gettimeofday(&tv, NULL);
|
||||
value = ((uint64_t)tv.tv_usec << 16) ^ tv.tv_sec ^ getpid();
|
||||
filename_template = &pattern[len - 6 - suffix_len];
|
||||
for (count = 0; count < TMP_MAX; ++count) {
|
||||
uint64_t v = value;
|
||||
/* Fill in the random bits. */
|
||||
filename_template[0] = letters[v % num_letters]; v /= num_letters;
|
||||
filename_template[1] = letters[v % num_letters]; v /= num_letters;
|
||||
filename_template[2] = letters[v % num_letters]; v /= num_letters;
|
||||
filename_template[3] = letters[v % num_letters]; v /= num_letters;
|
||||
filename_template[4] = letters[v % num_letters]; v /= num_letters;
|
||||
filename_template[5] = letters[v % num_letters]; v /= num_letters;
|
||||
|
||||
fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
|
||||
if (fd >= 0)
|
||||
return fd;
|
||||
/*
|
||||
* Fatal error (EPERM, ENOSPC etc).
|
||||
* It doesn't make sense to loop.
|
||||
*/
|
||||
if (errno != EEXIST)
|
||||
break;
|
||||
/*
|
||||
* This is a random value. It is only necessary that
|
||||
* the next TMP_MAX values generated by adding 7777 to
|
||||
* VALUE are different with (module 2^32).
|
||||
*/
|
||||
value += 7777;
|
||||
}
|
||||
/* We return the null string if we can't find a unique file name. */
|
||||
pattern[0] = '\0';
|
||||
return -1;
|
||||
}
|
||||
|
||||
int git_mkstemp_mode(char *pattern, int mode)
|
||||
{
|
||||
/* mkstemp is just mkstemps with no suffix */
|
||||
return git_mkstemps_mode(pattern, 0, mode);
|
||||
}
|
||||
|
||||
int xmkstemp_mode(char *filename_template, int mode)
|
||||
{
|
||||
int fd;
|
||||
char origtemplate[PATH_MAX];
|
||||
strlcpy(origtemplate, filename_template, sizeof(origtemplate));
|
||||
|
||||
fd = git_mkstemp_mode(filename_template, mode);
|
||||
if (fd < 0) {
|
||||
int saved_errno = errno;
|
||||
const char *nonrelative_template;
|
||||
|
||||
if (!filename_template[0])
|
||||
filename_template = origtemplate;
|
||||
|
||||
nonrelative_template = absolute_path(filename_template);
|
||||
errno = saved_errno;
|
||||
die_errno("Unable to create temporary file '%s'",
|
||||
nonrelative_template);
|
||||
}
|
||||
return fd;
|
||||
}
|
||||
|
||||
static int warn_if_unremovable(const char *op, const char *file, int rc)
|
||||
{
|
||||
int err;
|
||||
if (!rc || errno == ENOENT)
|
||||
return 0;
|
||||
err = errno;
|
||||
warning_errno("unable to %s '%s'", op, file);
|
||||
errno = err;
|
||||
return rc;
|
||||
}
|
||||
|
||||
int unlink_or_msg(const char *file, struct strbuf *err)
|
||||
{
|
||||
int rc = unlink(file);
|
||||
|
||||
assert(err);
|
||||
|
||||
if (!rc || errno == ENOENT)
|
||||
return 0;
|
||||
|
||||
strbuf_addf(err, "unable to unlink '%s': %s",
|
||||
file, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
|
||||
int unlink_or_warn(const char *file)
|
||||
{
|
||||
return warn_if_unremovable("unlink", file, unlink(file));
|
||||
}
|
||||
|
||||
int rmdir_or_warn(const char *file)
|
||||
{
|
||||
return warn_if_unremovable("rmdir", file, rmdir(file));
|
||||
}
|
||||
|
||||
int remove_or_warn(unsigned int mode, const char *file)
|
||||
{
|
||||
return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
|
||||
}
|
||||
|
||||
static int access_error_is_ok(int err, unsigned flag)
|
||||
{
|
||||
return (is_missing_file_error(err) ||
|
||||
((flag & ACCESS_EACCES_OK) && err == EACCES));
|
||||
}
|
||||
|
||||
int access_or_warn(const char *path, int mode, unsigned flag)
|
||||
{
|
||||
int ret = access(path, mode);
|
||||
if (ret && !access_error_is_ok(errno, flag))
|
||||
warn_on_inaccessible(path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int access_or_die(const char *path, int mode, unsigned flag)
|
||||
{
|
||||
int ret = access(path, mode);
|
||||
if (ret && !access_error_is_ok(errno, flag))
|
||||
die_errno(_("unable to access '%s'"), path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
char *xgetcwd(void)
|
||||
{
|
||||
struct strbuf sb = STRBUF_INIT;
|
||||
if (strbuf_getcwd(&sb))
|
||||
die_errno(_("unable to get current working directory"));
|
||||
return strbuf_detach(&sb, NULL);
|
||||
}
|
||||
|
||||
int xsnprintf(char *dst, size_t max, const char *fmt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
int len;
|
||||
|
||||
va_start(ap, fmt);
|
||||
len = vsnprintf(dst, max, fmt, ap);
|
||||
va_end(ap);
|
||||
|
||||
if (len < 0)
|
||||
BUG("your snprintf is broken");
|
||||
if (len >= max)
|
||||
BUG("attempt to snprintf into too-small buffer");
|
||||
return len;
|
||||
}
|
||||
|
||||
void write_file_buf(const char *path, const char *buf, size_t len)
|
||||
{
|
||||
int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
|
||||
if (write_in_full(fd, buf, len) < 0)
|
||||
die_errno(_("could not write to '%s'"), path);
|
||||
if (close(fd))
|
||||
die_errno(_("could not close '%s'"), path);
|
||||
}
|
||||
|
||||
void write_file(const char *path, const char *fmt, ...)
|
||||
{
|
||||
va_list params;
|
||||
struct strbuf sb = STRBUF_INIT;
|
||||
|
||||
va_start(params, fmt);
|
||||
strbuf_vaddf(&sb, fmt, params);
|
||||
va_end(params);
|
||||
|
||||
strbuf_complete_line(&sb);
|
||||
|
||||
write_file_buf(path, sb.buf, sb.len);
|
||||
strbuf_release(&sb);
|
||||
}
|
||||
|
||||
void sleep_millisec(int millisec)
|
||||
{
|
||||
poll(NULL, 0, millisec);
|
||||
}
|
||||
|
||||
int xgethostname(char *buf, size_t len)
|
||||
{
|
||||
/*
|
||||
* If the full hostname doesn't fit in buf, POSIX does not
|
||||
* specify whether the buffer will be null-terminated, so to
|
||||
* be safe, do it ourselves.
|
||||
*/
|
||||
int ret = gethostname(buf, len);
|
||||
if (!ret)
|
||||
buf[len - 1] = 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int is_empty_or_missing_file(const char *filename)
|
||||
{
|
||||
struct stat st;
|
||||
|
||||
if (stat(filename, &st) < 0) {
|
||||
if (errno == ENOENT)
|
||||
return 1;
|
||||
die_errno(_("could not stat %s"), filename);
|
||||
}
|
||||
|
||||
return !st.st_size;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue