/dl/string.c
C | 164 lines | 86 code | 29 blank | 49 comment | 37 complexity | aa74b86f9777535a89eea5b3eda3470d MD5 | raw file
Possible License(s): 0BSD
- /*
- * Copyright (C) 2011 Nick Johnson <nickbjohnson4224 at gmail.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #include <string.h>
- void *memcpy(void *dst, const void *src, size_t size) {
- size_t i;
- uint8_t *d = dst;
- const uint8_t *s = src;
- for (i = 0; i < size; i++) {
- d[i] = s[i];
- }
- return dst;
- }
- void *memclr(void *ptr, size_t size) {
- size_t i;
- uint8_t *a = ptr;
- for (i = 0; i < size; i++) {
- a[i] = 0;
- }
- return ptr;
- }
- char *strcpy(char *dst, const char *src) {
- size_t i;
- for (i = 0; src[i] != '\0'; i++) {
- dst[i] = src[i];
- }
- dst[i] = '\0';
- return dst;
- }
- int strcmp(const char *s1, const char *s2) {
- size_t i;
- for (i = 0;; i++) {
- if (s1[i] == s2[i]) {
- if (s1[i] == '\0') return 0;
- continue;
- }
- if (s1[i] == '\0') return -1;
- if (s2[i] == '\0') return 1;
- if (s1[i] < s2[i]) return -1;
- else return 1;
- }
- }
- size_t strlen(const char *str) {
- size_t i;
- for (i = 0; str[i]; i++);
- return i;
- }
- /*
- * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- /****************************************************************************
- * strlcpy
- *
- * Copy src to string dst of size siz. At most siz-1 characters
- * will be copied. Always NUL terminates (unless siz == 0).
- * Returns strlen(src); if retval >= siz, truncation occurred.
- */
- size_t strlcpy(char *dst, const char *src, size_t siz) {
- char *d = dst;
- const char *s = src;
- size_t n = siz;
- /* Copy as many bytes as will fit */
- if (n != 0) {
- while (--n != 0) {
- if ((*d++ = *s++) == '\0') {
- break;
- }
- }
- }
- /* Not enough room in dst, add NUL and traverse rest of src */
- if (n == 0) {
- if (siz != 0) {
- *d = '\0'; /* NUL-terminate dst */
- }
- while (*s++);
- }
- return (s - src - 1); /* count does not include NUL */
- }
- /****************************************************************************
- * strlcat
- *
- * Appends src to string dst of size siz (unlike strncat, siz is the
- * full size of dst, not space left). At most siz-1 characters
- * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
- * Returns strlen(src) + MIN(siz, strlen(initial dst)).
- * If retval >= siz, truncation occurred.
- */
- size_t strlcat(char *dst, const char *src, size_t siz) {
- char *d = dst;
- const char *s = src;
- size_t n = siz;
- size_t dlen;
- /* Find the end of dst and adjust bytes left but don't go past end */
- while (n-- != 0 && *d != '\0') {
- d++;
- }
- dlen = d - dst;
- n = siz - dlen;
- if (n == 0) {
- return (dlen + strlen(s));
- }
- while (*s != '\0') {
- if (n != 1) {
- *d++ = *s;
- n--;
- }
- s++;
- }
- *d = '\0';
- return (dlen + (s - src)); /* count does not include NUL */
- }