[PATCH v3 1/2] compat: add a mkstemps() compatibility function
- From
David Aguilar <davvid@gmail.com>
- Date
- May 28, 2009, 09:43 UTC
- Message-ID
- <1243503831-17993-1-git-send-email-davvid@gmail.com>
mkstemps() is a BSD extension so provide an implementation for cross-platform use.
Signed-off-by: David Aguilar <davvid@gmail.com> Tested-by: Johannes Sixt <j6t@kdbg.org> (Windows) --- Makefile | 19 +++++++++++++++ compat/mkstemps.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++ config.mak.in | 1 + configure.ac | 6 ++++ git-compat-util.h | 5 ++++ 5 files changed, 98 insertions(+), 0 deletions(-) create mode 100644 compat/mkstemps.c
diff --git a/Makefile b/Makefile index eaae45d..a70b5f0 100644 --- a/Makefile +++ b/Makefile @@ -52,6 +52,8 @@ all:: # # Define NO_MKDTEMP if you don't have mkdtemp in the C library. # +# Define NO_MKSTEMPS if you don't have mkstemps in the C library. +# # Define NO_SYS_SELECT_H if you don't have sys/select.h. # # Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link. @@ -636,10 +638,12 @@ EXTLIBS = ifeq ($(uname_S),Linux) NO_STRLCPY = YesPlease + NO_MKSTEMPS = YesPlease THREADED_DELTA_SEARCH = YesPlease endif ifeq ($(uname_S),GNU/kFreeBSD) NO_STRLCPY = YesPlease + NO_MKSTEMPS = YesPlease THREADED_DELTA_SEARCH = YesPlease endif ifeq ($(uname_S),UnixWare) @@ -651,6 +655,7 @@ ifeq ($(uname_S),UnixWare) SHELL_PATH = /usr/local/bin/bash NO_IPV6 = YesPlease NO_HSTRERROR = YesPlease + NO_MKSTEMPS = YesPlease BASIC_CFLAGS += -Kthread BASIC_CFLAGS += -I/usr/local/include BASIC_LDFLAGS += -L/usr/local/lib @@ -674,6 +679,7 @@ ifeq ($(uname_S),SCO_SV) SHELL_PATH = /usr/bin/bash NO_IPV6 = YesPlease NO_HSTRERROR = YesPlease + NO_MKSTEMPS = YesPlease BASIC_CFLAGS += -I/usr/local/include BASIC_LDFLAGS += -L/usr/local/lib NO_STRCASESTR = YesPlease @@ -702,6 +708,7 @@ ifeq ($(uname_S),SunOS) NO_MEMMEM = YesPlease NO_HSTRERROR = YesPlease NO_MKDTEMP = YesPlease + NO_MKSTEMPS = YesPlease OLD_ICONV = UnfortunatelyYes ifeq ($(uname_R),5.8) NO_UNSETENV = YesPlease @@ -724,6 +731,7 @@ ifeq ($(uname_O),Cygwin) NO_D_INO_IN_DIRENT = YesPlease NO_STRCASESTR = YesPlease NO_MEMMEM = YesPlease + NO_MKSTEMPS = YesPlease NO_SYMLINK_HEAD = YesPlease NEEDS_LIBICONV = YesPlease NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes @@ -767,11 +775,13 @@ ifeq ($(uname_S),NetBSD) BASIC_LDFLAGS += -L/usr/pkg/lib $(CC_LD_DYNPATH)/usr/pkg/lib THREADED_DELTA_SEARCH = YesPlease USE_ST_TIMESPEC = YesPlease + NO_MKSTEMPS = YesPlease endif ifeq ($(uname_S),AIX) NO_STRCASESTR=YesPlease NO_MEMMEM = YesPlease NO_MKDTEMP = YesPlease + NO_MKSTEMPS = YesPlease NO_STRLCPY = YesPlease NO_NSEC = YesPlease FREAD_READS_DIRECTORIES = UnfortunatelyYes @@ -787,12 +797,14 @@ endif ifeq ($(uname_S),GNU) # GNU/Hurd NO_STRLCPY=YesPlease + NO_MKSTEMPS = YesPlease endif ifeq ($(uname_S),IRIX64) NO_IPV6=YesPlease NO_SETENV=YesPlease NO_STRCASESTR=YesPlease NO_MEMMEM = YesPlease + NO_MKSTEMPS = YesPlease NO_STRLCPY = YesPlease NO_SOCKADDR_STORAGE=YesPlease SHELL_PATH=/usr/gnu/bin/bash @@ -805,6 +817,7 @@ ifeq ($(uname_S),HP-UX) NO_SETENV=YesPlease NO_STRCASESTR=YesPlease NO_MEMMEM = YesPlease + NO_MKSTEMPS = YesPlease NO_STRLCPY = YesPlease NO_MKDTEMP = YesPlease NO_UNSETENV = YesPlease @@ -834,6 +847,7 @@ ifneq (,$(findstring MINGW,$(uname_S))) NO_C99_FORMAT = YesPlease NO_STRTOUMAX = YesPlease NO_MKDTEMP = YesPlease + NO_MKSTEMPS = YesPlease SNPRINTF_RETURNS_BOGUS = YesPlease NO_SVN_TESTS = YesPlease NO_PERL_MAKEMAKER = YesPlease @@ -853,6 +867,7 @@ ifneq (,$(findstring MINGW,$(uname_S))) endif ifneq (,$(findstring arm,$(uname_M))) ARM_SHA1 = YesPlease + NO_MKSTEMPS = YesPlease endif -include config.mak.autogen @@ -1011,6 +1026,10 @@ ifdef NO_MKDTEMP COMPAT_CFLAGS += -DNO_MKDTEMP COMPAT_OBJS += compat/mkdtemp.o endif +ifdef NO_MKSTEMPS + COMPAT_CFLAGS += -DNO_MKSTEMPS + COMPAT_OBJS += compat/mkstemps.o +endif ifdef NO_UNSETENV COMPAT_CFLAGS += -DNO_UNSETENV COMPAT_OBJS += compat/unsetenv.o diff --git a/compat/mkstemps.c b/compat/mkstemps.c new file mode 100644 index 0000000..87ebc2a --- /dev/null +++ b/compat/mkstemps.c @@ -0,0 +1,67 @@ +#include "../git-compat-util.h" + +#ifndef TMP_MAX +#define TMP_MAX 16384 +#endif + +/* Adapted from libiberty's mkstemp.c. */ +int gitmkstemps(char *pattern, int suffix_len) +{ + static const char letters[] = + "abcdefghijklmnopqrstuvwxyz" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "0123456789"; + static const int num_letters = 62; + uint64_t value; + struct timeval tv; + char *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 = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid(); + template = &pattern[len - 6 - suffix_len]; + for (count = 0; count < TMP_MAX; ++count) { + uint64_t v = value; + /* Fill in the random bits. */ + template[0] = letters[v % num_letters]; v/= num_letters; + template[1] = letters[v % num_letters]; v/= num_letters; + template[2] = letters[v % num_letters]; v/= num_letters; + template[3] = letters[v % num_letters]; v/= num_letters; + template[4] = letters[v % num_letters]; v/= num_letters; + template[5] = letters[v % num_letters]; v/= num_letters; + + fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, 0600); + 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'; + errno = EINVAL; + return -1; +} diff --git a/config.mak.in b/config.mak.in index 7cce0c1..b6619af 100644 --- a/config.mak.in +++ b/config.mak.in @@ -46,6 +46,7 @@ NO_STRTOUMAX=@NO_STRTOUMAX@ NO_SETENV=@NO_SETENV@ NO_UNSETENV=@NO_UNSETENV@ NO_MKDTEMP=@NO_MKDTEMP@ +NO_MKSTEMPS=@NO_MKSTEMPS@ NO_ICONV=@NO_ICONV@ OLD_ICONV=@OLD_ICONV@ NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@ diff --git a/configure.ac b/configure.ac index 4e728bc..95dccd4 100644 --- a/configure.ac +++ b/configure.ac @@ -676,6 +676,12 @@ GIT_CHECK_FUNC(mkdtemp, [NO_MKDTEMP=], [NO_MKDTEMP=YesPlease]) AC_SUBST(NO_MKDTEMP) +# Define NO_MKSTEMPS if you don't have mkstemps in the C library. +GIT_CHECK_FUNC(mkstemps, +[NO_MKSTEMPS=], +[NO_MKSTEMPS=YesPlease]) +AC_SUBST(NO_MKSTEMPS) +# # # Define NO_MMAP if you want to avoid mmap. # diff --git a/git-compat-util.h b/git-compat-util.h index c7cf2d5..f7217ad 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -232,6 +232,11 @@ extern int gitsetenv(const char *, const char *, int); extern char *gitmkdtemp(char *); #endif +#ifdef NO_MKSTEMPS +#define mkstemps gitmkstemps +extern int gitmkstemps(char *, int); +#endif + #ifdef NO_UNSETENV #define unsetenv gitunsetenv extern void gitunsetenv(const char *);
-- 1.6.3.1.169.g33fd