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Diffstat (limited to 'compat/compat.c')
| -rw-r--r-- | compat/compat.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/compat/compat.c b/compat/compat.c new file mode 100644 index 0000000..5fb2be8 --- /dev/null +++ b/compat/compat.c @@ -0,0 +1,361 @@ +/** + * @file compat.c + * @author Michal Vasko <mvasko@cesnet.cz> + * @brief compatibility functions + * + * Copyright (c) 2021 CESNET, z.s.p.o. + * + * This source code is licensed under BSD 3-Clause License (the "License"). + * You may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://opensource.org/licenses/BSD-3-Clause + */ +#define _POSIX_C_SOURCE 200809L /* fdopen, _POSIX_PATH_MAX, strdup */ +#define _ISOC99_SOURCE /* vsnprintf */ + +#include "compat.h" + +#include <errno.h> +#include <inttypes.h> +#include <limits.h> +#include <pthread.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifndef _MSC_VER +#include <sys/time.h> +#endif +#include <time.h> +#include <unistd.h> + +#ifndef HAVE_VDPRINTF +int +vdprintf(int fd, const char *format, va_list ap) +{ + FILE *stream; + int count = 0; + + stream = fdopen(dup(fd), "a+"); + if (stream) { + count = vfprintf(stream, format, ap); + fclose(stream); + } + return count; +} + +#endif + +#ifndef HAVE_ASPRINTF +int +asprintf(char **strp, const char *fmt, ...) +{ + int ret; + va_list ap; + + va_start(ap, fmt); + ret = vasprintf(strp, fmt, ap); + va_end(ap); + return ret; +} + +#endif + +#ifndef HAVE_VASPRINTF +int +vasprintf(char **strp, const char *fmt, va_list ap) +{ + va_list ap2; + + va_copy(ap2, ap); + int l = vsnprintf(0, 0, fmt, ap2); + + va_end(ap2); + + if ((l < 0) || !(*strp = malloc(l + 1U))) { + return -1; + } + + return vsnprintf(*strp, l + 1U, fmt, ap); +} + +#endif + +#ifndef HAVE_GETLINE +ssize_t +getline(char **lineptr, size_t *n, FILE *stream) +{ + static char line[256]; + char *ptr; + ssize_t len; + + if (!lineptr || !n) { + errno = EINVAL; + return -1; + } + + if (ferror(stream) || feof(stream)) { + return -1; + } + + if (!fgets(line, 256, stream)) { + return -1; + } + + ptr = strchr(line, '\n'); + if (ptr) { + *ptr = '\0'; + } + + len = strlen(line); + + if (len + 1 < 256) { + ptr = realloc(*lineptr, 256); + if (!ptr) { + return -1; + } + *lineptr = ptr; + *n = 256; + } + + strcpy(*lineptr, line); + return len; +} + +#endif + +#ifndef HAVE_STRNDUP +char * +strndup(const char *s, size_t n) +{ + char *buf; + size_t len = 0; + + /* strnlen */ + for ( ; (len < n) && (s[len] != '\0'); ++len) {} + + if (!(buf = malloc(len + 1U))) { + return NULL; + } + + memcpy(buf, s, len); + buf[len] = '\0'; + return buf; +} + +#endif + +#ifndef HAVE_STRNSTR +char * +strnstr(const char *s, const char *find, size_t slen) +{ + char c, sc; + size_t len; + + if ((c = *find++) != '\0') { + len = strlen(find); + do { + do { + if ((slen-- < 1) || ((sc = *s++) == '\0')) { + return NULL; + } + } while (sc != c); + if (len > slen) { + return NULL; + } + } while (strncmp(s, find, len)); + s--; + } + return (char *)s; +} + +#endif + +#ifndef HAVE_STRCHRNUL +char * +strchrnul(const char *s, int c) +{ + char *p = strchr(s, c); + + return p ? p : (char *)s + strlen(s); +} + +#endif + +#ifndef HAVE_GET_CURRENT_DIR_NAME +char * +get_current_dir_name(void) +{ + char tmp[_POSIX_PATH_MAX]; + char *retval = NULL; + + if (getcwd(tmp, sizeof(tmp))) { + retval = strdup(tmp); + if (!retval) { + errno = ENOMEM; + } + } + + return retval; +} + +#endif + +#ifndef _MSC_VER +#ifndef HAVE_PTHREAD_MUTEX_TIMEDLOCK +int +pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *abstime) +{ + int64_t nsec_diff; + int32_t diff; + struct timespec cur, dur; + int rc; + + /* try to acquire the lock and, if we fail, sleep for 5ms. */ + while ((rc = pthread_mutex_trylock(mutex)) == EBUSY) { + /* get real time */ +#ifdef CLOCK_REALTIME + clock_gettime(CLOCK_REALTIME, &cur); +#else + struct timeval tv; + + gettimeofday(&tv, NULL); + cur.tv_sec = (time_t)tv.tv_sec; + cur.tv_nsec = 1000L * (long)tv.tv_usec; +#endif + + /* get time diff */ + nsec_diff = 0; + nsec_diff += (((int64_t)abstime->tv_sec) - ((int64_t)cur.tv_sec)) * 1000000000L; + nsec_diff += ((int64_t)abstime->tv_nsec) - ((int64_t)cur.tv_nsec); + diff = (nsec_diff ? nsec_diff / 1000000L : 0); + + if (diff < 1) { + /* timeout */ + break; + } else if (diff < 5) { + /* sleep until timeout */ + dur.tv_sec = 0; + dur.tv_nsec = (long)diff * 1000000; + } else { + /* sleep 5 ms */ + dur.tv_sec = 0; + dur.tv_nsec = 5000000; + } + + nanosleep(&dur, NULL); + } + + return rc; +} + +#endif +#endif + +#ifndef HAVE_REALPATH +#ifdef _WIN32 +char * +realpath(const char *path, char *resolved_path) +{ + char *resolved = _fullpath(resolved_path, path, PATH_MAX); + + if ((_access(resolved, 0) == -1) && (errno == ENOENT)) { + return NULL; + } + return resolved; +} + +#elif defined (__NetBSD__) +char * +realpath(const char *path, char *resolved_path) +{ + ssize_t nbytes; + + nbytes = readlink(path, resolved_path, PATH_MAX); + if (nbytes == -1) { + return NULL; + } + return resolved_path; +} + +#else +#error No realpath() implementation for this platform is available. +#endif +#endif + +#ifndef HAVE_LOCALTIME_R +#ifdef _WIN32 +struct tm * +localtime_r(const time_t *timep, struct tm *result) +{ + errno_t res = localtime_s(result, timep); + + if (res) { + return NULL; + } else { + return result; + } +} + +#else +#error No localtime_r() implementation for this platform is available. +#endif +#endif + +#ifndef HAVE_GMTIME_R +#ifdef _WIN32 +struct tm * +gmtime_r(const time_t *timep, struct tm *result) +{ + errno_t res = gmtime_s(result, timep); + + if (res) { + return NULL; + } else { + return result; + } +} + +#else +#error No gmtime_r() implementation for this platform is available. +#endif +#endif + +#ifndef HAVE_DIRNAME +#ifdef _WIN32 +#include <shlwapi.h> +char * +dirname(char *path) +{ + PathRemoveFileSpecA(path); + return path; +} + +#else +#error No dirname() implementation for this platform is available. +#endif +#endif + +#ifndef HAVE_SETENV +#ifdef _WIN32 +int +setenv(const char *name, const char *value, int overwrite) +{ + int errcode = 0; + + if (!overwrite) { + size_t envsize = 0; + + errcode = getenv_s(&envsize, NULL, 0, name); + if (errcode || envsize) { + return errcode; + } + } + return _putenv_s(name, value); +} + +#else +#error No setenv() implementation for this platform is available. +#endif +#endif |