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https://gitlab.freedesktop.org/wayland/weston
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bc3c37840c
asprintf() has the problem that it leaves *strp undefined when it fails. Here is a simple wrapper that ensures NULL if asprintf() fails, which is much more convenient to use. This will be useful in future patches, where one needs to return error messages from maybe failing functions, and more. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright © 2016 Samsung Electronics Co., Ltd
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef WESTON_STRING_HELPERS_H
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#define WESTON_STRING_HELPERS_H
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdarg.h>
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#include <stdio.h>
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/* Convert string to integer
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*
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* Parses a base-10 number from the given string. Checks that the
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* string is not blank, contains only numerical characters, and is
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* within the range of INT32_MIN to INT32_MAX. If the validation is
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* successful the result is stored in *value; otherwise *value is
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* unchanged and errno is set appropriately.
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*
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* \return true if the number parsed successfully, false on error
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*/
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static inline bool
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safe_strtoint(const char *str, int32_t *value)
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{
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long ret;
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char *end;
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assert(str != NULL);
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errno = 0;
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ret = strtol(str, &end, 10);
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if (errno != 0) {
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return false;
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} else if (end == str || *end != '\0') {
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errno = EINVAL;
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return false;
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}
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if ((long)((int32_t)ret) != ret) {
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errno = ERANGE;
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return false;
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}
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*value = (int32_t)ret;
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return true;
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}
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/**
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* Exactly like asprintf(), but sets *str_out to NULL if it fails.
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*
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* If str_out is NULL, does nothing.
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*/
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static inline void __attribute__ ((format (printf, 2, 3)))
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str_printf(char **str_out, const char *fmt, ...)
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{
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char *msg;
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va_list ap;
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int ret;
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if (!str_out)
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return;
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va_start(ap, fmt);
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ret = vasprintf(&msg, fmt, ap);
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va_end(ap);
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if (ret >= 0)
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*str_out = msg;
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else
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*str_out = NULL;
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}
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#endif /* WESTON_STRING_HELPERS_H */
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