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78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/* Trim a string from whitespace
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*
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* Copyright (c) 2014 Mattias Walström <lazzer@gmail.com>
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* Copyright (c) 2021 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* @file strtrim.c
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* @author Mattias Walström
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* @author Joachim Wiberg
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* @date 2014,2021
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* @copyright ISC License
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "lite.h"
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/**
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* Strip leading and trailing whitespace from a string
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* @param str The string to trim
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*
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* Trims a string from any leading and trailing white-space, returns the
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* trimmed result in the same buffer.
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*
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* @returns If @p str is a valid, non-NULL string this function returns
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* the same string stripped from whitespace. This function only returns
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* @c NULL if @p str itself is @c NULL.
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*/
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char *strtrim(char *str)
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{
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char *start, *end;
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if (!str) {
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errno = EINVAL;
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return NULL;
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}
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start = str;
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while (isspace(*start))
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start++;
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if (*start == 0) {
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str[0] = 0;
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return str;
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}
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end = start + strlen(start) - 1;
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while (end > start && isspace(*end))
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end--;
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*(++end) = 0;
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memmove(str, start, end - start + 1);
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return str;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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