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78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*
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* strtok.c
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*
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* Ullrich von Bassewitz, 11.12.1998
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*/
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#include <string.h>
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Memory location that holds the last input */
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static char* Last = 0;
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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char* strtok (register char* s1, const char* s2)
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{
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char c;
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char* start;
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/* Use the stored location if called with a NULL pointer */
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if (s1 == 0) {
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s1 = Last;
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}
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/* If s1 is empty, there are no more tokens. Return 0 in this case. */
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if (*s1 == '\0') {
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return 0;
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}
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/* Search the address of the first element in s1 that equals none
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* of the characters in s2.
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*/
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while ((c = *s1) && strchr (s2, c) != 0) {
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++s1;
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}
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if (c == '\0') {
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/* No more tokens found */
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Last = s1;
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return 0;
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}
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/* Remember the start of the token */
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start = s1;
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/* Search for the end of the token */
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while ((c = *s1) && strchr (s2, c) == 0) {
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++s1;
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}
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if (c == '\0') {
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/* Last element */
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Last = s1;
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} else {
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*s1 = '\0';
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Last = s1 + 1;
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}
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/* Return the start of the token */
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return start;
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}
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