100 lines
1.6 KiB
C
100 lines
1.6 KiB
C
/*
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safe C library functions
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This upgrades unsafe C functions like "strcpy()" to safer equivalents,
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like "safe_strcpy()".
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NOTE: This is for maintaining a policy of "no unsafe functions"
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*/
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#include "util-safefunc.h"
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#include <errno.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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/**
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* Case-insensitive memcmp()
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*/
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#ifdef __GNUC__
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int
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memcasecmp(const void *lhs, const void *rhs, size_t length)
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{
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int i;
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for (i=0; i<length; i++) {
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if (tolower(((char*)lhs)[i]) != tolower(((char*)rhs)[i]))
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return -1;
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}
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return 0;
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}
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#endif
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/**
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* Safe version of `strcpy()`
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*/
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void
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safe_strcpy(char *dst, size_t sizeof_dst, const char *src)
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{
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size_t i;
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if (sizeof_dst == 0)
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return;
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if (dst == NULL)
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return;
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if (src == NULL) {
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dst[0] = 0;
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return;
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}
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for (i=0; src[i]; i++) {
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if (i >= sizeof_dst) {
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dst[0] = 0;
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return;
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} else
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dst[i] = src[i];
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}
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if (i >= sizeof_dst) {
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dst[0] = 0;
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return ;
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} else
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dst[i] = src[i];
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return;
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}
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int
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safe_localtime(struct tm* _tm, const time_t *time)
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{
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struct tm *x;
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x = localtime(time);
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if (x == NULL) {
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memset(_tm, 0, sizeof(*_tm));
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return -1;
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}
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memcpy(_tm, x, sizeof(*_tm));
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return 0;
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}
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int
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safe_gmtime(struct tm* _tm, const time_t *time)
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{
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struct tm *x;
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x = gmtime(time);
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if (x == NULL) {
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memset(_tm, 0, sizeof(*_tm));
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return -1;
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}
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memcpy(_tm, x, sizeof(*_tm));
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return 0;
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}
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