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23 lines
573 B
C
23 lines
573 B
C
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#include <string.h>
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/* case-independent string matching, similar to strstr but
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* matching */
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char * strcasestr(char* haystack, char* needle) {
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int i;
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int nlength = strlen (needle);
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int hlength = strlen (haystack);
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if (nlength > hlength) return NULL;
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if (hlength <= 0) return NULL;
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if (nlength <= 0) return haystack;
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/* hlength and nlength > 0, nlength <= hlength */
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for (i = 0; i <= (hlength - nlength); i++) {
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if (strncasecmp (haystack + i, needle, nlength) == 0) {
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return haystack + i;
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}
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}
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/* substring not found */
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return NULL;
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}
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