diff options
Diffstat (limited to 'os_compat.c')
| -rw-r--r-- | os_compat.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/os_compat.c b/os_compat.c new file mode 100644 index 00000000..f7c23839 --- /dev/null +++ b/os_compat.c @@ -0,0 +1,230 @@ +/* + * Simulate ANSI/POSIX conformance on platforms that don't have it + * + * This file is Copyright (c) 2010 by the GPSD project + * BSD terms apply: see the file COPYING in the distribution root for details. + */ + +#include <time.h> +#include <sys/time.h> + +#include "compiler.h" + +#ifndef HAVE_CLOCK_GETTIME + +/* + * Note that previous versions of this code made use of clock_get_time() + * on OSX, as a way to get time of day with nanosecond resolution. But + * it turns out that clock_get_time() only has microsecond resolution, + * in spite of the data format, and it's also substantially slower than + * gettimeofday(). Thus, it makes no sense to do anything special for OSX. + */ + +int clock_gettime(clockid_t clk_id UNUSED, struct timespec *ts) +{ + struct timeval tv; + if (gettimeofday(&tv, NULL) < 0) + return -1; + ts->tv_sec = tv.tv_sec; + ts->tv_nsec = tv.tv_usec * 1000; + return 0; +} +#endif /* HAVE_CLOCK_GETTIME */ + +/* end */ +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> + +#include "gpsd_config.h" +#ifndef HAVE_DAEMON +#if defined (HAVE_PATH_H) +#include <paths.h> +#else +#if !defined (_PATH_DEVNULL) +#define _PATH_DEVNULL "/dev/null" +#endif +#endif + +int daemon(int nochdir, int noclose) +/* compatible with the daemon(3) found on Linuxes and BSDs */ +{ + int fd; + + switch (fork()) { + case -1: + return -1; + case 0: /* child side */ + break; + default: /* parent side */ + exit(EXIT_SUCCESS); + } + + if (setsid() == -1) + return -1; + if ((nochdir==0) && (chdir("/") == -1)) + return -1; + if ((noclose==0) && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { + (void)dup2(fd, STDIN_FILENO); + (void)dup2(fd, STDOUT_FILENO); + (void)dup2(fd, STDERR_FILENO); + if (fd > 2) + (void)close(fd); + } + /* coverity[leaked_handle] Intentional handle duplication */ + return 0; +} + +#endif /* HAVE_DAEMON */ + +// end +/* + * This file is Copyright (c) 2010 by the GPSD project + * BSD terms apply: see the file COPYING in the distribution root for details. + */ +#include <string.h> +#include <time.h> /* for time_t */ +#include "gpsd_config.h" + +/* + * These versions use memcpy and strlen() because they are often + * heavily optimized down to assembler level. Thus, likely to be + * faster even with the function call overhead. + */ + +#ifndef HAVE_STRLCAT +/* + * Appends src to string dst of size siz (unlike strncat, siz is the + * full size of dst, not space left). At most siz-1 characters + * will be copied. Always NUL terminates (unless siz <= strlen(dst)). + * Returns strlen(src) + MIN(siz, strlen(initial dst)). + * If retval >= siz, truncation occurred. + */ +size_t strlcat(char *dst, const char *src, size_t siz) +{ + size_t slen = strlen(src); + size_t dlen = strlen(dst); + if (siz != 0) { + if (dlen + slen < siz) + memcpy(dst + dlen, src, slen + 1); + else { + memcpy(dst + dlen, src, siz - dlen - 1); + dst[siz - 1] = '\0'; + } + } + return dlen + slen; +} + +#ifdef __UNUSED__ +/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ + +/* + * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +size_t strlcat(char *dst, const char *src, size_t siz) +{ + char *d = dst; + const char *s = src; + size_t n = siz; + size_t dlen; + + /* Find the end of dst and adjust bytes left but don't go past end */ + while (n-- != 0 && *d != '\0') + d++; + dlen = (size_t) (d - dst); + n = siz - dlen; + + if (n == 0) + return (dlen + strlen(s)); + while (*s != '\0') { + if (n != 1) { + *d++ = *s; + n--; + } + s++; + } + *d = '\0'; + + return (dlen + (s - src)); /* count does not include NUL */ +} +#endif /* __UNUSED__ */ +#endif /* HAVE_STRLCAT */ + +#ifndef HAVE_STRLCPY +/* + * Copy src to string dst of size siz. At most siz-1 characters + * will be copied. Always NUL terminates (unless siz == 0). + * Returns strlen(src); if retval >= siz, truncation occurred. + */ +size_t strlcpy(char *dst, const char *src, size_t siz) +{ + size_t len = strlen(src); + if (siz != 0) { + if (len >= siz) { + memcpy(dst, src, siz - 1); + dst[siz - 1] = '\0'; + } else + memcpy(dst, src, len + 1); + } + return len; +} + +#ifdef __UNUSED__ +/* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */ + +/* + * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +size_t strlcpy(char *dst, const char *src, size_t siz) +{ + char *d = dst; + const char *s = src; + size_t n = siz; + + /* Copy as many bytes as will fit */ + if (n != 0) { + while (--n != 0) { + if ((*d++ = *s++) == '\0') + break; + } + } + + /* Not enough room in dst, add NUL and traverse rest of src */ + if (n == 0) { + if (siz != 0) + *d = '\0'; /* NUL-terminate dst */ + while (*s++ != '\0') + continue; + } + + return ((size_t) (s - src - 1)); /* count does not include NUL */ +} +#endif /* __UNUSED__ */ +#endif /* HAVE_STRLCPY */ |