#ifndef GIT_COMPAT_UTIL_H #define GIT_COMPAT_UTIL_H #ifdef USE_MSVC_CRTDBG /* * For these to work they must appear very early in each * file -- before most of the standard header files. */ #include #include #endif #define _FILE_OFFSET_BITS 64 /* Derived from Linux "Features Test Macro" header * Convenience macros to test the versions of gcc (or * a compatible compiler). * Use them like this: * #if GIT_GNUC_PREREQ (2,8) * ... code requiring gcc 2.8 or later ... * #endif */ #if defined(__GNUC__) && defined(__GNUC_MINOR__) # define GIT_GNUC_PREREQ(maj, min) \ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) #else #define GIT_GNUC_PREREQ(maj, min) 0 #endif #ifndef FLEX_ARRAY /* * See if our compiler is known to support flexible array members. */ #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580)) # define FLEX_ARRAY /* empty */ #elif defined(__GNUC__) # if (__GNUC__ >= 3) # define FLEX_ARRAY /* empty */ # else # define FLEX_ARRAY 0 /* older GNU extension */ # endif #endif /* * Otherwise, default to safer but a bit wasteful traditional style */ #ifndef FLEX_ARRAY # define FLEX_ARRAY 1 #endif #endif /* * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression. * @cond: the compile-time condition which must be true. * * Your compile will fail if the condition isn't true, or can't be evaluated * by the compiler. This can be used in an expression: its value is "0". * * Example: * #define foo_to_char(foo) \ * ((char *)(foo) \ * + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0)) */ #define BUILD_ASSERT_OR_ZERO(cond) \ (sizeof(char [1 - 2*!(cond)]) - 1) #if GIT_GNUC_PREREQ(3, 1) /* &arr[0] degrades to a pointer: a different type from an array */ # define BARF_UNLESS_AN_ARRAY(arr) \ BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \ __typeof__(&(arr)[0]))) #else # define BARF_UNLESS_AN_ARRAY(arr) 0 #endif /* * ARRAY_SIZE - get the number of elements in a visible array * @x: the array whose size you want. * * This does not work on pointers, or arrays declared as [], or * function parameters. With correct compiler support, such usage * will cause a build error (see the build_assert_or_zero macro). */ #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x)) #define bitsizeof(x) (CHAR_BIT * sizeof(x)) #define maximum_signed_value_of_type(a) \ (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a))) #define maximum_unsigned_value_of_type(a) \ (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a))) /* * Signed integer overflow is undefined in C, so here's a helper macro * to detect if the sum of two integers will overflow. * * Requires: a >= 0, typeof(a) equals typeof(b) */ #define signed_add_overflows(a, b) \ ((b) > maximum_signed_value_of_type(a) - (a)) #define unsigned_add_overflows(a, b) \ ((b) > maximum_unsigned_value_of_type(a) - (a)) /* * Returns true if the multiplication of "a" and "b" will * overflow. The types of "a" and "b" must match and must be unsigned. * Note that this macro evaluates "a" twice! */ #define unsigned_mult_overflows(a, b) \ ((a) && (b) > maximum_unsigned_value_of_type(a) / (a)) #ifdef __GNUC__ #define TYPEOF(x) (__typeof__(x)) #else #define TYPEOF(x) #endif #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits)))) #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */ #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) /* Approximation of the length of the decimal representation of this type. */ #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1) #ifdef __MINGW64__ #define _POSIX_C_SOURCE 1 #elif defined(__sun__) /* * On Solaris, when _XOPEN_EXTENDED is set, its header file * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE * setting to say we are XPG5 or XPG6. Also on Solaris, * XPG6 programs must be compiled with a c99 compiler, while * non XPG6 programs must be compiled with a pre-c99 compiler. */ # if __STDC_VERSION__ - 0 >= 199901L # define _XOPEN_SOURCE 600 # else # define _XOPEN_SOURCE 500 # endif #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \ !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \ !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \ !defined(__CYGWIN__) #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */ #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */ #endif #define _ALL_SOURCE 1 #define _GNU_SOURCE 1 #define _BSD_SOURCE 1 #define _DEFAULT_SOURCE 1 #define _NETBSD_SOURCE 1 #define _SGI_SOURCE 1 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */ # if !defined(_WIN32_WINNT) # define _WIN32_WINNT 0x0600 # endif #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */ #include #include #define GIT_WINDOWS_NATIVE #endif #include #include #include #include #include #include #include #include #ifdef HAVE_STRINGS_H #include /* for strcasecmp() */ #endif #include #include #ifdef NEEDS_SYS_PARAM_H #include #endif #include #include #include #include #include #include #include #include #include #if !defined(NO_POLL_H) #include #elif !defined(NO_SYS_POLL_H) #include #else /* Pull the compat stuff */ #include #endif #ifdef HAVE_BSD_SYSCTL #include #endif #if defined(__CYGWIN__) #include "compat/win32/path-utils.h" #endif #if defined(__MINGW32__) /* pull in Windows compatibility stuff */ #include "compat/win32/path-utils.h" #include "compat/mingw.h" #elif defined(_MSC_VER) #include "compat/win32/path-utils.h" #include "compat/msvc.h" #else #include #include #include #include #include #include #ifndef NO_SYS_SELECT_H #include #endif #include #include #include #include #include #include #ifndef NO_INTTYPES_H #include #else #include #endif #ifdef NO_INTPTR_T /* * On I16LP32, ILP32 and LP64 "long" is the safe bet, however * on LLP86, IL33LLP64 and P64 it needs to be "long long", * while on IP16 and IP16L32 it is "int" (resp. "short") * Size needs to match (or exceed) 'sizeof(void *)'. * We can't take "long long" here as not everybody has it. */ typedef long intptr_t; typedef unsigned long uintptr_t; #endif #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */ #include #define _ALL_SOURCE 1 #endif /* used on Mac OS X */ #ifdef PRECOMPOSE_UNICODE #include "compat/precompose_utf8.h" #else static inline const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix) { return prefix; } static inline const char *precompose_string_if_needed(const char *in) { return in; } #define probe_utf8_pathname_composition() #endif #ifdef MKDIR_WO_TRAILING_SLASH #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b)) int compat_mkdir_wo_trailing_slash(const char*, mode_t); #endif #ifdef NO_STRUCT_ITIMERVAL struct itimerval { struct timeval it_interval; struct timeval it_value; }; #endif #ifdef NO_SETITIMER static inline int setitimer(int which, const struct itimerval *value, struct itimerval *newvalue) { return 0; /* pretend success */ } #endif #ifndef NO_LIBGEN_H #include #else #define basename gitbasename char *gitbasename(char *); #define dirname gitdirname char *gitdirname(char *); #endif #ifndef NO_ICONV #include #endif #ifndef NO_OPENSSL #ifdef __APPLE__ #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0 #include #undef DEPRECATED_ATTRIBUTE #define DEPRECATED_ATTRIBUTE #undef __AVAILABILITY_MACROS_USES_AVAILABILITY #endif #include #include #endif #ifdef HAVE_SYSINFO # include #endif /* On most systems would have given us this, but * not on some systems (e.g. z/OS). */ #ifndef NI_MAXHOST #define NI_MAXHOST 1025 #endif #ifndef NI_MAXSERV #define NI_MAXSERV 32 #endif /* On most systems would have given us this, but * not on some systems (e.g. GNU/Hurd). */ #ifndef PATH_MAX #define PATH_MAX 4096 #endif typedef uintmax_t timestamp_t; #define PRItime PRIuMAX #define parse_timestamp strtoumax #define TIME_MAX UINTMAX_MAX #define TIME_MIN 0 #ifndef PATH_SEP #define PATH_SEP ':' #endif #ifdef HAVE_PATHS_H #include #endif #ifndef _PATH_DEFPATH #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin" #endif #ifndef platform_core_config static inline int noop_core_config(const char *var, const char *value, void *cb) { return 0; } #define platform_core_config noop_core_config #endif int lstat_cache_aware_rmdir(const char *path); #if !defined(__MINGW32__) && !defined(_MSC_VER) #define rmdir lstat_cache_aware_rmdir #endif #ifndef has_dos_drive_prefix static inline int git_has_dos_drive_prefix(const char *path) { return 0; } #define has_dos_drive_prefix git_has_dos_drive_prefix #endif #ifndef skip_dos_drive_prefix static inline int git_skip_dos_drive_prefix(char **path) { return 0; } #define skip_dos_drive_prefix git_skip_dos_drive_prefix #endif #ifndef is_dir_sep static inline int git_is_dir_sep(int c) { return c == '/'; } #define is_dir_sep git_is_dir_sep #endif #ifndef offset_1st_component static inline int git_offset_1st_component(const char *path) { return is_dir_sep(path[0]); } #define offset_1st_component git_offset_1st_component #endif #ifndef is_valid_path #define is_valid_path(path) 1 #endif #ifndef is_path_owned_by_current_user #ifdef __TANDEM #define ROOT_UID 65535 #else #define ROOT_UID 0 #endif /* * Do not use this function when * (1) geteuid() did not say we are running as 'root', or * (2) using this function will compromise the system. * * PORTABILITY WARNING: * This code assumes uid_t is unsigned because that is what sudo does. * If your uid_t type is signed and all your ids are positive then it * should all work fine. * If your version of sudo uses negative values for uid_t or it is * buggy and return an overflowed value in SUDO_UID, then git might * fail to grant access to your repository properly or even mistakenly * grant access to someone else. * In the unlikely scenario this happened to you, and that is how you * got to this message, we would like to know about it; so sent us an * email to git@vger.kernel.org indicating which platform you are * using and which version of sudo, so we can improve this logic and * maybe provide you with a patch that would prevent this issue again * in the future. */ static inline void extract_id_from_env(const char *env, uid_t *id) { const char *real_uid = getenv(env); /* discard anything empty to avoid a more complex check below */ if (real_uid && *real_uid) { char *endptr = NULL; unsigned long env_id; errno = 0; /* silent overflow errors could trigger a bug here */ env_id = strtoul(real_uid, &endptr, 10); if (!*endptr && !errno) *id = env_id; } } static inline int is_path_owned_by_current_uid(const char *path) { struct stat st; uid_t euid; if (lstat(path, &st)) return 0; euid = geteuid(); if (euid == ROOT_UID) { if (st.st_uid == ROOT_UID) return 1; else extract_id_from_env("SUDO_UID", &euid); } return st.st_uid == euid; } #define is_path_owned_by_current_user is_path_owned_by_current_uid #endif #ifndef find_last_dir_sep static inline char *git_find_last_dir_sep(const char *path) { return strrchr(path, '/'); } #define find_last_dir_sep git_find_last_dir_sep #endif #ifndef has_dir_sep static inline int git_has_dir_sep(const char *path) { return !!strchr(path, '/'); } #define has_dir_sep(path) git_has_dir_sep(path) #endif #ifndef query_user_email #define query_user_email() NULL #endif #ifdef __TANDEM #include #include #ifndef NSIG /* * NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest * known, by detective work using kill -l as a list is all signals * instead of signal.h where it should be. */ # define NSIG 100 #endif #endif #if defined(__HP_cc) && (__HP_cc >= 61000) #define NORETURN __attribute__((noreturn)) #define NORETURN_PTR #elif defined(__GNUC__) && !defined(NO_NORETURN) #define NORETURN __attribute__((__noreturn__)) #define NORETURN_PTR __attribute__((__noreturn__)) #elif defined(_MSC_VER) #define NORETURN __declspec(noreturn) #define NORETURN_PTR #else #define NORETURN #define NORETURN_PTR #ifndef __GNUC__ #ifndef __attribute__ #define __attribute__(x) #endif #endif #endif /* The sentinel attribute is valid from gcc version 4.0 */ #if defined(__GNUC__) && (__GNUC__ >= 4) #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel)) #else #define LAST_ARG_MUST_BE_NULL #endif #define MAYBE_UNUSED __attribute__((__unused__)) #include "compat/bswap.h" #include "wildmatch.h" struct strbuf; /* General helper functions */ void vreportf(const char *prefix, const char *err, va_list params); NORETURN void usage(const char *err); NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2))); NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2))); NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2))); int error(const char *err, ...) __attribute__((format (printf, 1, 2))); int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2))); void warning(const char *err, ...) __attribute__((format (printf, 1, 2))); void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2))); #ifndef NO_OPENSSL #ifdef APPLE_COMMON_CRYPTO #include "compat/apple-common-crypto.h" #else #include #include #endif /* APPLE_COMMON_CRYPTO */ #include #endif /* NO_OPENSSL */ /* * Let callers be aware of the constant return value; this can help * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though, * because some compilers may not support variadic macros. Since we're only * trying to help gcc, anyway, it's OK; other compilers will fall back to * using the function as usual. */ #if defined(__GNUC__) static inline int const_error(void) { return -1; } #define error(...) (error(__VA_ARGS__), const_error()) #define error_errno(...) (error_errno(__VA_ARGS__), const_error()) #endif typedef void (*report_fn)(const char *, va_list params); void set_die_routine(NORETURN_PTR report_fn routine); void set_error_routine(report_fn routine); report_fn get_error_routine(void); void set_warn_routine(report_fn routine); report_fn get_warn_routine(void); void set_die_is_recursing_routine(int (*routine)(void)); int starts_with(const char *str, const char *prefix); int istarts_with(const char *str, const char *prefix); /* * If the string "str" begins with the string found in "prefix", return 1. * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in * the string right after the prefix). * * Otherwise, return 0 and leave "out" untouched. * * Examples: * * [extract branch name, fail if not a branch] * if (!skip_prefix(ref, "refs/heads/", &branch) * return -1; * * [skip prefix if present, otherwise use whole string] * skip_prefix(name, "refs/heads/", &name); */ static inline int skip_prefix(const char *str, const char *prefix, const char **out) { do { if (!*prefix) { *out = str; return 1; } } while (*str++ == *prefix++); return 0; } /* * If the string "str" is the same as the string in "prefix", then the "arg" * parameter is set to the "def" parameter and 1 is returned. * If the string "str" begins with the string found in "prefix" and then a * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1" * (i.e., to the point in the string right after the prefix and the "=" sign), * and 1 is returned. * * Otherwise, return 0 and leave "arg" untouched. * * When we accept both a "--key" and a "--key=" option, this function * can be used instead of !strcmp(arg, "--key") and then * skip_prefix(arg, "--key=", &arg) to parse such an option. */ int skip_to_optional_arg_default(const char *str, const char *prefix, const char **arg, const char *def); static inline int skip_to_optional_arg(const char *str, const char *prefix, const char **arg) { return skip_to_optional_arg_default(str, prefix, arg, ""); } /* * Like skip_prefix, but promises never to read past "len" bytes of the input * buffer, and returns the remaining number of bytes in "out" via "outlen". */ static inline int skip_prefix_mem(const char *buf, size_t len, const char *prefix, const char **out, size_t *outlen) { size_t prefix_len = strlen(prefix); if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) { *out = buf + prefix_len; *outlen = len - prefix_len; return 1; } return 0; } /* * If buf ends with suffix, return 1 and subtract the length of the suffix * from *len. Otherwise, return 0 and leave *len untouched. */ static inline int strip_suffix_mem(const char *buf, size_t *len, const char *suffix) { size_t suflen = strlen(suffix); if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen)) return 0; *len -= suflen; return 1; } /* * If str ends with suffix, return 1 and set *len to the size of the string * without the suffix. Otherwise, return 0 and set *len to the size of the * string. * * Note that we do _not_ NUL-terminate str to the new length. */ static inline int strip_suffix(const char *str, const char *suffix, size_t *len) { *len = strlen(str); return strip_suffix_mem(str, len, suffix); } static inline int ends_with(const char *str, const char *suffix) { size_t len; return strip_suffix(str, suffix, &len); } #define SWAP(a, b) do { \ void *_swap_a_ptr = &(a); \ void *_swap_b_ptr = &(b); \ unsigned char _swap_buffer[sizeof(a)]; \ memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \ memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \ BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \ memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \ } while (0) #if defined(NO_MMAP) || defined(USE_WIN32_MMAP) #ifndef PROT_READ #define PROT_READ 1 #define PROT_WRITE 2 #define MAP_PRIVATE 1 #endif #define mmap git_mmap #define munmap git_munmap void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset); int git_munmap(void *start, size_t length); #else /* NO_MMAP || USE_WIN32_MMAP */ #include #endif /* NO_MMAP || USE_WIN32_MMAP */ #ifdef NO_MMAP /* This value must be multiple of (pagesize * 2) */ #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024) #else /* NO_MMAP */ /* This value must be multiple of (pagesize * 2) */ #define DEFAULT_PACKED_GIT_WINDOW_SIZE \ (sizeof(void*) >= 8 \ ? 1 * 1024 * 1024 * 1024 \ : 32 * 1024 * 1024) #endif /* NO_MMAP */ #ifndef MAP_FAILED #define MAP_FAILED ((void *)-1) #endif #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT #define on_disk_bytes(st) ((st).st_size) #else #define on_disk_bytes(st) ((st).st_blocks * 512) #endif #ifdef NEEDS_MODE_TRANSLATION #undef S_IFMT #undef S_IFREG #undef S_IFDIR #undef S_IFLNK #undef S_IFBLK #undef S_IFCHR #undef S_IFIFO #undef S_IFSOCK #define S_IFMT 0170000 #define S_IFREG 0100000 #define S_IFDIR 0040000 #define S_IFLNK 0120000 #define S_IFBLK 0060000 #define S_IFCHR 0020000 #define S_IFIFO 0010000 #define S_IFSOCK 0140000 #ifdef stat #undef stat #endif #define stat(path, buf) git_stat(path, buf) int git_stat(const char *, struct stat *); #ifdef fstat #undef fstat #endif #define fstat(fd, buf) git_fstat(fd, buf) int git_fstat(int, struct stat *); #ifdef lstat #undef lstat #endif #define lstat(path, buf) git_lstat(path, buf) int git_lstat(const char *, struct stat *); #endif #define DEFAULT_PACKED_GIT_LIMIT \ ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256)) #ifdef NO_PREAD #define pread git_pread ssize_t git_pread(int fd, void *buf, size_t count, off_t offset); #endif /* * Forward decl that will remind us if its twin in cache.h changes. * This function is used in compat/pread.c. But we can't include * cache.h there. */ ssize_t read_in_full(int fd, void *buf, size_t count); #ifdef NO_SETENV #define setenv gitsetenv int gitsetenv(const char *, const char *, int); #endif #ifdef NO_MKDTEMP #define mkdtemp gitmkdtemp char *gitmkdtemp(char *); #endif #ifdef NO_UNSETENV #define unsetenv gitunsetenv void gitunsetenv(const char *); #endif #ifdef NO_STRCASESTR #define strcasestr gitstrcasestr char *gitstrcasestr(const char *haystack, const char *needle); #endif #ifdef NO_STRLCPY #define strlcpy gitstrlcpy size_t gitstrlcpy(char *, const char *, size_t); #endif #ifdef NO_STRTOUMAX #define strtoumax gitstrtoumax uintmax_t gitstrtoumax(const char *, char **, int); #define strtoimax gitstrtoimax intmax_t gitstrtoimax(const char *, char **, int); #endif #ifdef NO_HSTRERROR #define hstrerror githstrerror const char *githstrerror(int herror); #endif #ifdef NO_MEMMEM #define memmem gitmemmem void *gitmemmem(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen); #endif #ifdef OVERRIDE_STRDUP #ifdef strdup #undef strdup #endif #define strdup gitstrdup char *gitstrdup(const char *s); #endif #ifdef NO_GETPAGESIZE #define getpagesize() sysconf(_SC_PAGESIZE) #endif #ifndef O_CLOEXEC #define O_CLOEXEC 0 #endif #ifdef FREAD_READS_DIRECTORIES # if !defined(SUPPRESS_FOPEN_REDEFINITION) # ifdef fopen # undef fopen # endif # define fopen(a,b) git_fopen(a,b) # endif FILE *git_fopen(const char*, const char*); #endif #ifdef SNPRINTF_RETURNS_BOGUS #ifdef snprintf #undef snprintf #endif #define snprintf git_snprintf int git_snprintf(char *str, size_t maxsize, const char *format, ...); #ifdef vsnprintf #undef vsnprintf #endif #define vsnprintf git_vsnprintf int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap); #endif #ifdef OPEN_RETURNS_EINTR #undef open #define open git_open_with_retry int git_open_with_retry(const char *path, int flag, ...); #endif #ifdef __GLIBC_PREREQ #if __GLIBC_PREREQ(2, 1) #define HAVE_STRCHRNUL #endif #endif #ifndef HAVE_STRCHRNUL #define strchrnul gitstrchrnul static inline char *gitstrchrnul(const char *s, int c) { while (*s && *s != c) s++; return (char *)s; } #endif #ifdef NO_INET_PTON int inet_pton(int af, const char *src, void *dst); #endif #ifdef NO_INET_NTOP const char *inet_ntop(int af, const void *src, char *dst, size_t size); #endif #ifdef NO_PTHREADS #define atexit git_atexit int git_atexit(void (*handler)(void)); #endif static inline size_t st_add(size_t a, size_t b) { if (unsigned_add_overflows(a, b)) die("size_t overflow: %"PRIuMAX" + %"PRIuMAX, (uintmax_t)a, (uintmax_t)b); return a + b; } #define st_add3(a,b,c) st_add(st_add((a),(b)),(c)) #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d)) static inline size_t st_mult(size_t a, size_t b) { if (unsigned_mult_overflows(a, b)) die("size_t overflow: %"PRIuMAX" * %"PRIuMAX, (uintmax_t)a, (uintmax_t)b); return a * b; } static inline size_t st_sub(size_t a, size_t b) { if (a < b) die("size_t underflow: %"PRIuMAX" - %"PRIuMAX, (uintmax_t)a, (uintmax_t)b); return a - b; } static inline int cast_size_t_to_int(size_t a) { if (a > INT_MAX) die("number too large to represent as int on this platform: %"PRIuMAX, (uintmax_t)a); return (int)a; } #ifdef HAVE_ALLOCA_H # include # define xalloca(size) (alloca(size)) # define xalloca_free(p) do {} while (0) #else # define xalloca(size) (xmalloc(size)) # define xalloca_free(p) (free(p)) #endif char *xstrdup(const char *str); void *xmalloc(size_t size); void *xmallocz(size_t size); void *xmallocz_gently(size_t size); void *xmemdupz(const void *data, size_t len); char *xstrndup(const char *str, size_t len); void *xrealloc(void *ptr, size_t size); void *xcalloc(size_t nmemb, size_t size); void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset); const char *mmap_os_err(void); void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset); int xopen(const char *path, int flags, ...); ssize_t xread(int fd, void *buf, size_t len); ssize_t xwrite(int fd, const void *buf, size_t len); ssize_t xpread(int fd, void *buf, size_t len, off_t offset); int xdup(int fd); FILE *xfopen(const char *path, const char *mode); FILE *xfdopen(int fd, const char *mode); int xmkstemp(char *temp_filename); int xmkstemp_mode(char *temp_filename, int mode); char *xgetcwd(void); FILE *fopen_for_writing(const char *path); FILE *fopen_or_warn(const char *path, const char *mode); /* * Like strncmp, but only return zero if s is NUL-terminated and exactly len * characters long. If it is not, consider it greater than t. */ int xstrncmpz(const char *s, const char *t, size_t len); /* * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note * that ptr is used twice, so don't pass e.g. ptr++. */ #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0) #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc))) #define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x))) #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc))) #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \ BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src)))) static inline void copy_array(void *dst, const void *src, size_t n, size_t size) { if (n) memcpy(dst, src, st_mult(size, n)); } #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \ BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src)))) static inline void move_array(void *dst, const void *src, size_t n, size_t size) { if (n) memmove(dst, src, st_mult(size, n)); } /* * These functions help you allocate structs with flex arrays, and copy * the data directly into the array. For example, if you had: * * struct foo { * int bar; * char name[FLEX_ARRAY]; * }; * * you can do: * * struct foo *f; * FLEX_ALLOC_MEM(f, name, src, len); * * to allocate a "foo" with the contents of "src" in the "name" field. * The resulting struct is automatically zero'd, and the flex-array field * is NUL-terminated (whether the incoming src buffer was or not). * * The FLEXPTR_* variants operate on structs that don't use flex-arrays, * but do want to store a pointer to some extra data in the same allocated * block. For example, if you have: * * struct foo { * char *name; * int bar; * }; * * you can do: * * struct foo *f; * FLEXPTR_ALLOC_STR(f, name, src); * * and "name" will point to a block of memory after the struct, which will be * freed along with the struct (but the pointer can be repointed anywhere). * * The *_STR variants accept a string parameter rather than a ptr/len * combination. * * Note that these macros will evaluate the first parameter multiple * times, and it must be assignable as an lvalue. */ #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \ size_t flex_array_len_ = (len); \ (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \ memcpy((void *)(x)->flexname, (buf), flex_array_len_); \ } while (0) #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \ size_t flex_array_len_ = (len); \ (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \ memcpy((x) + 1, (buf), flex_array_len_); \ (x)->ptrname = (void *)((x)+1); \ } while(0) #define FLEX_ALLOC_STR(x, flexname, str) \ FLEX_ALLOC_MEM((x), flexname, (str), strlen(str)) #define FLEXPTR_ALLOC_STR(x, ptrname, str) \ FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str)) static inline char *xstrdup_or_null(const char *str) { return str ? xstrdup(str) : NULL; } static inline size_t xsize_t(off_t len) { if (len < 0 || (uintmax_t) len > SIZE_MAX) die("Cannot handle files this big"); return (size_t) len; } __attribute__((format (printf, 3, 4))) int xsnprintf(char *dst, size_t max, const char *fmt, ...); #ifndef HOST_NAME_MAX #define HOST_NAME_MAX 256 #endif int xgethostname(char *buf, size_t len); /* in ctype.c, for kwset users */ extern const unsigned char tolower_trans_tbl[256]; /* Sane ctype - no locale, and works with signed chars */ #undef isascii #undef isspace #undef isdigit #undef isalpha #undef isalnum #undef isprint #undef islower #undef isupper #undef tolower #undef toupper #undef iscntrl #undef ispunct #undef isxdigit extern const unsigned char sane_ctype[256]; #define GIT_SPACE 0x01 #define GIT_DIGIT 0x02 #define GIT_ALPHA 0x04 #define GIT_GLOB_SPECIAL 0x08 #define GIT_REGEX_SPECIAL 0x10 #define GIT_PATHSPEC_MAGIC 0x20 #define GIT_CNTRL 0x40 #define GIT_PUNCT 0x80 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0) #define isascii(x) (((x) & ~0x7f) == 0) #define isspace(x) sane_istest(x,GIT_SPACE) #define isdigit(x) sane_istest(x,GIT_DIGIT) #define isalpha(x) sane_istest(x,GIT_ALPHA) #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT) #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e) #define islower(x) sane_iscase(x, 1) #define isupper(x) sane_iscase(x, 0) #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL) #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL) #define iscntrl(x) (sane_istest(x,GIT_CNTRL)) #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \ GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC) #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1) #define tolower(x) sane_case((unsigned char)(x), 0x20) #define toupper(x) sane_case((unsigned char)(x), 0) #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC) static inline int sane_case(int x, int high) { if (sane_istest(x, GIT_ALPHA)) x = (x & ~0x20) | high; return x; } static inline int sane_iscase(int x, int is_lower) { if (!sane_istest(x, GIT_ALPHA)) return 0; if (is_lower) return (x & 0x20) != 0; else return (x & 0x20) == 0; } /* * Like skip_prefix, but compare case-insensitively. Note that the comparison * is done via tolower(), so it is strictly ASCII (no multi-byte characters or * locale-specific conversions). */ static inline int skip_iprefix(const char *str, const char *prefix, const char **out) { do { if (!*prefix) { *out = str; return 1; } } while (tolower(*str++) == tolower(*prefix++)); return 0; } static inline int strtoul_ui(char const *s, int base, unsigned int *result) { unsigned long ul; char *p; errno = 0; /* negative values would be accepted by strtoul */ if (strchr(s, '-')) return -1; ul = strtoul(s, &p, base); if (errno || *p || p == s || (unsigned int) ul != ul) return -1; *result = ul; return 0; } static inline int strtol_i(char const *s, int base, int *result) { long ul; char *p; errno = 0; ul = strtol(s, &p, base); if (errno || *p || p == s || (int) ul != ul) return -1; *result = ul; return 0; } void git_stable_qsort(void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *)); #ifdef INTERNAL_QSORT #define qsort git_stable_qsort #endif #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar) static inline void sane_qsort(void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *)) { if (nmemb > 1) qsort(base, nmemb, size, compar); } #define STABLE_QSORT(base, n, compar) \ git_stable_qsort((base), (n), sizeof(*(base)), compar) #ifndef HAVE_ISO_QSORT_S int git_qsort_s(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *, void *), void *ctx); #define qsort_s git_qsort_s #endif #define QSORT_S(base, n, compar, ctx) do { \ if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \ BUG("qsort_s() failed"); \ } while (0) #ifndef REG_STARTEND #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd" #endif static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size, size_t nmatch, regmatch_t pmatch[], int eflags) { assert(nmatch > 0 && pmatch); pmatch[0].rm_so = 0; pmatch[0].rm_eo = size; return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND); } #ifndef DIR_HAS_BSD_GROUP_SEMANTICS # define FORCE_DIR_SET_GID S_ISGID #else # define FORCE_DIR_SET_GID 0 #endif #ifdef NO_NSEC #undef USE_NSEC #define ST_CTIME_NSEC(st) 0 #define ST_MTIME_NSEC(st) 0 #else #ifdef USE_ST_TIMESPEC #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec)) #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec)) #else #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec)) #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec)) #endif #endif #ifdef UNRELIABLE_FSTAT #define fstat_is_reliable() 0 #else #define fstat_is_reliable() 1 #endif #ifndef va_copy /* * Since an obvious implementation of va_list would be to make it a * pointer into the stack frame, a simple assignment will work on * many systems. But let's try to be more portable. */ #ifdef __va_copy #define va_copy(dst, src) __va_copy(dst, src) #else #define va_copy(dst, src) ((dst) = (src)) #endif #endif /* * This is always defined as a first step towards making the use of variadic * macros unconditional. If it causes compilation problems on your platform, * please report it to the Git mailing list at git@vger.kernel.org. */ #define HAVE_VARIADIC_MACROS 1 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */ extern int BUG_exit_code; #ifdef HAVE_VARIADIC_MACROS __attribute__((format (printf, 3, 4))) NORETURN void BUG_fl(const char *file, int line, const char *fmt, ...); #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__) #else __attribute__((format (printf, 1, 2))) NORETURN void BUG(const char *fmt, ...); #endif /* * Preserves errno, prints a message, but gives no warning for ENOENT. * Returns 0 on success, which includes trying to unlink an object that does * not exist. */ int unlink_or_warn(const char *path); /* * Tries to unlink file. Returns 0 if unlink succeeded * or the file already didn't exist. Returns -1 and * appends a message to err suitable for * 'error("%s", err->buf)' on error. */ int unlink_or_msg(const char *file, struct strbuf *err); /* * Preserves errno, prints a message, but gives no warning for ENOENT. * Returns 0 on success, which includes trying to remove a directory that does * not exist. */ int rmdir_or_warn(const char *path); /* * Calls the correct function out of {unlink,rmdir}_or_warn based on * the supplied file mode. */ int remove_or_warn(unsigned int mode, const char *path); /* * Call access(2), but warn for any error except "missing file" * (ENOENT or ENOTDIR). */ #define ACCESS_EACCES_OK (1U << 0) int access_or_warn(const char *path, int mode, unsigned flag); int access_or_die(const char *path, int mode, unsigned flag); /* Warn on an inaccessible file if errno indicates this is an error */ int warn_on_fopen_errors(const char *path); /* * Open with O_NOFOLLOW, or equivalent. Note that the fallback equivalent * may be racy. Do not use this as protection against an attacker who can * simultaneously create paths. */ int open_nofollow(const char *path, int flags); #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__) #define USE_PARENS_AROUND_GETTEXT_N 1 #endif #ifndef SHELL_PATH # define SHELL_PATH "/bin/sh" #endif #ifndef _POSIX_THREAD_SAFE_FUNCTIONS static inline void flockfile(FILE *fh) { ; /* nothing */ } static inline void funlockfile(FILE *fh) { ; /* nothing */ } #define getc_unlocked(fh) getc(fh) #endif #ifdef FILENO_IS_A_MACRO int git_fileno(FILE *stream); # ifndef COMPAT_CODE_FILENO # undef fileno # define fileno(p) git_fileno(p) # endif #endif #ifdef NEED_ACCESS_ROOT_HANDLER int git_access(const char *path, int mode); # ifndef COMPAT_CODE_ACCESS # ifdef access # undef access # endif # define access(path, mode) git_access(path, mode) # endif #endif /* * Our code often opens a path to an optional file, to work on its * contents when we can successfully open it. We can ignore a failure * to open if such an optional file does not exist, but we do want to * report a failure in opening for other reasons (e.g. we got an I/O * error, or the file is there, but we lack the permission to open). * * Call this function after seeing an error from open() or fopen() to * see if the errno indicates a missing file that we can safely ignore. */ static inline int is_missing_file_error(int errno_) { return (errno_ == ENOENT || errno_ == ENOTDIR); } int cmd_main(int, const char **); /* * Intercept all calls to exit() and route them to trace2 to * optionally emit a message before calling the real exit(). */ int trace2_cmd_exit_fl(const char *file, int line, int code); #define exit(code) exit(trace2_cmd_exit_fl(__FILE__, __LINE__, (code))) /* * You can mark a stack variable with UNLEAK(var) to avoid it being * reported as a leak by tools like LSAN or valgrind. The argument * should generally be the variable itself (not its address and not what * it points to). It's safe to use this on pointers which may already * have been freed, or on pointers which may still be in use. * * Use this _only_ for a variable that leaks by going out of scope at * program exit (so only from cmd_* functions or their direct helpers). * Normal functions, especially those which may be called multiple * times, should actually free their memory. This is only meant as * an annotation, and does nothing in non-leak-checking builds. */ #ifdef SUPPRESS_ANNOTATED_LEAKS void unleak_memory(const void *ptr, size_t len); #define UNLEAK(var) unleak_memory(&(var), sizeof(var)) #else #define UNLEAK(var) do {} while (0) #endif /* * This include must come after system headers, since it introduces macros that * replace system names. */ #include "banned.h" /* * container_of - Get the address of an object containing a field. * * @ptr: pointer to the field. * @type: type of the object. * @member: name of the field within the object. */ #define container_of(ptr, type, member) \ ((type *) ((char *)(ptr) - offsetof(type, member))) /* * helper function for `container_of_or_null' to avoid multiple * evaluation of @ptr */ static inline void *container_of_or_null_offset(void *ptr, size_t offset) { return ptr ? (char *)ptr - offset : NULL; } /* * like `container_of', but allows returned value to be NULL */ #define container_of_or_null(ptr, type, member) \ (type *)container_of_or_null_offset(ptr, offsetof(type, member)) /* * like offsetof(), but takes a pointer to a variable of type which * contains @member, instead of a specified type. * @ptr is subject to multiple evaluation since we can't rely on __typeof__ * everywhere. */ #if defined(__GNUC__) /* clang sets this, too */ #define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member) #else /* !__GNUC__ */ #define OFFSETOF_VAR(ptr, member) \ ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr)) #endif /* !__GNUC__ */ void sleep_millisec(int millisec); #endif