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The standard {{strncpy()}} function does not guarantee that the resulting string is null terminated \[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\]. If there is no null character in the first {{n}} characters of the {{source}} array, the result may not be null terminated. |
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char *source;
char a[NTBS_SIZE];
/* ... */
if (source) {
errno_t err = strncpy(a, source, 5);
if (err != 0) {
/* Handle error */
}
}
else {
/* handle NULL string condition */
}
|
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The {{strncpy_s()}} function copies up to {{n}} characters from the source array to a destination array \[[TR 24731|AA. Bibliography#ISO/IEC TR 24731-1-2007]\]. If no null character was copied from the source array, then the {{n{}}}th position in the destination array is set to a null character, guaranteeing that the resulting string is null-terminated. |
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|---|---|---|---|---|
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char *source;
char a[NTBS_SIZE];
/* ... */
if (source) {
errno_t err = strncpy_s(a, sizeof(a), source, 5);
if (err != 0) {
/* Handle error */
}
}
else {
/* handle NULL string condition */
}
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