lib/libc: Add implementation of strncpy.

This commit is contained in:
Thorsten von Eicken 2020-07-02 12:48:16 -07:00 committed by Damien George
parent 9aa214077e
commit 98e583430f
1 changed files with 17 additions and 0 deletions

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@ -169,6 +169,23 @@ char *strcpy(char *dest, const char *src) {
return dest;
}
// Public Domain implementation of strncpy from:
// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strncpy_function
char *strncpy(char *s1, const char *s2, size_t n) {
char *dst = s1;
const char *src = s2;
/* Copy bytes, one at a time. */
while (n > 0) {
n--;
if ((*dst++ = *src++) == '\0') {
/* If we get here, we found a null character at the end of s2 */
*dst = '\0';
break;
}
}
return s1;
}
// needed because gcc optimises strcpy + strcat to this
char *stpcpy(char *dest, const char *src) {
while (*src) {