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-rw-r--r--compat/compat.c361
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