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Diffstat (limited to 'lib/libc/amd64/string/strsep.c')
-rw-r--r-- | lib/libc/amd64/string/strsep.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libc/amd64/string/strsep.c b/lib/libc/amd64/string/strsep.c new file mode 100644 index 000000000000..9fda56d7e135 --- /dev/null +++ b/lib/libc/amd64/string/strsep.c @@ -0,0 +1,57 @@ +/*- + * Copyright (c) 2023 The FreeBSD Foundation + * + * This software was developed by Robert Clausecker <fuz@FreeBSD.org> + * under sponsorship from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE + */ + +#include <sys/cdefs.h> +#include <string.h> + +size_t __strcspn(const char *, const char *); + +/* + * We have a fast strcspn() on amd64. Use it over a direct + * implementation of strsep for better performance. + */ +char * +strsep(char **stringp, const char *delim) +{ + size_t n; + char *s; + + s = *stringp; + if (s == NULL) + return (NULL); + + n = __strcspn(s, delim); + if (s[n] == '\0') + *stringp = NULL; + else { + s[n] = '\0'; + *stringp = s + n + 1; + } + + return (s); +} |