The function mkstemps() isn't available in all libc implementations. In glibc it first became available in 2.11, so platforms such as RHEL 5 & Slackware 13 lack it. This is likely true of many non-LINUX platforms as well.
This fixes breakage that was introduced with a0fdac29 "Create temporary file with name as suffix."
Signed-off-by: Drew Northup <n1xim.email@gmail.com> ---
This work-around is taken from Git and was inspired by code in libiberty. It is presumed that this isn't a problem due to compatible license terms.
A (virtually identical) version of this available in https://github.com/n1xim/tig/tree/mkstemps_wkarnd (differences only in the commit message).
configure.ac | 4 ++++ io.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ io.h | 14 +++++++++++ 3 files changed, 95 insertions(+)
Show changes to 3 files +95 −0
configure.ac, io.c, io.h
diff --git a/configure.ac b/configure.ac index 8dd2508..40e1f85 100644 --- a/configure.ac +++ b/configure.ac @@ -21,6 +21,10 @@ AC_SUBST(CURSES_LIB) AM_ICONV +dnl Not all platforms have mkstemps +AC_CHECK_FUNC([mkstemps], [AC_DEFINE([HAVE_MKSTEMPS], [1], + [Define if mkstemps is available.])]) + AC_PROG_CC AC_CHECK_PROGS(ASCIIDOC, [asciidoc], [false]) diff --git a/io.c b/io.c index 3ff1d1c..f1b6fbc 100644 --- a/io.c +++ b/io.c @@ -237,6 +237,83 @@ encoding_convert(struct encoding *encoding, char *line) } /* + * Compatibility: no mkstemps() + */ + +/* Adapted from libiberty's mkstemp.c via Git's wrapper.c. */ + +#undef TMP_MAX +#define TMP_MAX 16384 + +int tig_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 *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, 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 tigmkstemps(char *pattern, int suffix_len) +{ + return tig_mkstemps_mode(pattern, suffix_len, 0600); +} + +/* * Executing external commands. */ diff --git a/io.h b/io.h index 646989d..8f43216 100644 --- a/io.h +++ b/io.h @@ -16,6 +16,9 @@ #include "tig.h" +/* Needed for mkstemps workaround */ +#include <stdint.h> + /* * Argument array helpers. */ @@ -41,6 +44,17 @@ struct encoding *encoding_open(const char *fromcode); char *encoding_convert(struct encoding *encoding, char *line); /* + * Compatibility: no mkstemps() + */ + +#ifndef HAVE_MKSTEMPS +#define mkstemps tigmkstemps +#endif + +int tigmkstemps(char *, int); +int tig_mkstemps_mode(char *pattern, int suffix_len, int mode); + +/* * Executing external commands. */
-- 1.8.0