[babeltrace.git] / include / babeltrace / compat / string.h

#ifndef _BABELTRACE_COMPAT_STRING_H
#define _BABELTRACE_COMPAT_STRING_H

/*
 * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <string.h>
#include <stdlib.h>

#if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))

/* XSI-compliant strerror_r */
static inline
int compat_strerror_r(int errnum, char *buf, size_t buflen)
{
	return strerror_r(errnum, buf, buflen);
}

#else

/* GNU-compliant strerror_r */
static inline
int compat_strerror_r(int errnum, char *buf, size_t buflen)
{
	char *retbuf;

	retbuf = strerror_r(errnum, buf, buflen);
	if (retbuf != buf)
		strncpy(buf, retbuf, buflen);
	buf[buflen - 1] = '\0';
	return 0;
}

#endif

#ifdef HAVE_STRNLEN
static inline
size_t bt_strnlen(const char *str, size_t max)
{
	return strnlen(str, max);
}
#else
static inline
size_t bt_strnlen(const char *str, size_t max)
{
	size_t ret;
	const char *end;

	end = memchr(str, 0, max);

	if (end) {
		ret = (size_t) (end - str);
	} else {
		ret = max;
	}

	return ret;
}
#endif /* HAVE_STRNLEN */

#ifdef HAVE_STRNDUP
static inline
char *bt_strndup(const char *s, size_t n)
{
	return strndup(s, n);
}
#else
static inline
char *bt_strndup(const char *s, size_t n)
{
	char *ret;
	size_t navail;

	if (!s) {
		ret = NULL;
		goto end;
	}

	/* min() */
	navail = strlen(s) + 1;
	if ((n + 1) < navail) {
		navail = n + 1;
	}

	ret = malloc(navail);
	if (!ret) {
		goto end;
	}

	memcpy(ret, s, navail);
	ret[navail - 1] = '\0';
end:
	return ret;
}
#endif /* HAVE_STRNDUP */

#endif /* _BABELTRACE_COMPAT_STRING_H */
Commit	Line	Data
	1	#ifndef _BABELTRACE_COMPAT_STRING_H
	2	#define _BABELTRACE_COMPAT_STRING_H
	3
	4	/*
	5	* Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	20	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	22	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	23	* SOFTWARE.
	24	*/
	25
	26	#include <string.h>
	27	#include <stdlib.h>
	28
	29	#if !defined(__linux__) \|\| ((_POSIX_C_SOURCE >= 200112L \|\| _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
	30
	31	/* XSI-compliant strerror_r */
	32	static inline
	33	int compat_strerror_r(int errnum, char *buf, size_t buflen)
	34	{
	35	return strerror_r(errnum, buf, buflen);
	36	}
	37
	38	#else
	39
	40	/* GNU-compliant strerror_r */
	41	static inline
	42	int compat_strerror_r(int errnum, char *buf, size_t buflen)
	43	{
	44	char *retbuf;
	45
	46	retbuf = strerror_r(errnum, buf, buflen);
	47	if (retbuf != buf)
	48	strncpy(buf, retbuf, buflen);
	49	buf[buflen - 1] = '\0';
	50	return 0;
	51	}
	52
	53	#endif
	54
	55	#ifdef HAVE_STRNLEN
	56	static inline
	57	size_t bt_strnlen(const char *str, size_t max)
	58	{
	59	return strnlen(str, max);
	60	}
	61	#else
	62	static inline
	63	size_t bt_strnlen(const char *str, size_t max)
	64	{
	65	size_t ret;
	66	const char *end;
	67
	68	end = memchr(str, 0, max);
	69
	70	if (end) {
	71	ret = (size_t) (end - str);
	72	} else {
	73	ret = max;
	74	}
	75
	76	return ret;
	77	}
	78	#endif /* HAVE_STRNLEN */
	79
	80	#ifdef HAVE_STRNDUP
	81	static inline
	82	char bt_strndup(const char s, size_t n)
	83	{
	84	return strndup(s, n);
	85	}
	86	#else
	87	static inline
	88	char bt_strndup(const char s, size_t n)
	89	{
	90	char *ret;
	91	size_t navail;
	92
	93	if (!s) {
	94	ret = NULL;
	95	goto end;
	96	}
	97
	98	/* min() */
	99	navail = strlen(s) + 1;
	100	if ((n + 1) < navail) {
	101	navail = n + 1;
	102	}
	103
	104	ret = malloc(navail);
	105	if (!ret) {
	106	goto end;
	107	}
	108
	109	memcpy(ret, s, navail);
	110	ret[navail - 1] = '\0';
	111	end:
	112	return ret;
	113	}
	114	#endif /* HAVE_STRNDUP */
	115
	116	#endif /* _BABELTRACE_COMPAT_STRING_H */