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98 lines
2.6 KiB
98 lines
2.6 KiB
/*
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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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