> > It is kalled SIGSEGV ... > Because strlen is simply an > size_t i; char *string; > for(i=0;*(string+i)!='\0';i++); > return i; > > And when (string+1) points outside the space allocated .. well .. possible > it doesn't find a '\0' there .. possible it don't even can read it .. > > And thats why you can't do that. Good point. Here's a revised version (also incorporating other suggestions made) size_t sstrlen(const char *s, size_t n) { size_t i; for(i = 0; (*(s+i) != '\0' && i < n); i++); return i; } char *sstrncpy(char *dst, size_t n1, const char *src, size_t n2) { if (sstrlen(src, n2) > (n1 - 1)) { errno = ENOSPC; dst[0] = NULL; return NULL; } strncpy(dst, src, n2); return dst; } Something similar could be done with strncat as well. Note that I don't return the number of bytes written because I wanted to remain consistent with the existing strncpy. Chris
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