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241 lines
4.4 KiB
C
241 lines
4.4 KiB
C
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/* strtokc.c */
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#include <string.h>
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#include "Strn.h"
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char *
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strtokc(char *parsestr, const char *delims, char **context)
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{
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char *cp;
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const char *cp2;
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char c, c2;
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char *start;
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if (parsestr == NULL)
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start = *context;
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else
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start = parsestr;
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if ((start == NULL) || (delims == NULL)) {
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*context = NULL;
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return NULL;
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}
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/* Eat leading delimiters. */
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for (cp = start; ; ) {
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next1:
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c = *cp++;
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if (c == '\0') {
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/* No more tokens. */
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*context = NULL;
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return (NULL);
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}
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for (cp2 = delims; ; ) {
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c2 = (char) *cp2++;
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if (c2 == '\0') {
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/* This character was not a delimiter.
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* The token starts here.
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*/
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start = cp - 1;
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goto starttok;
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}
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if (c2 == c) {
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/* This char was a delimiter. */
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/* Skip it, look at next character. */
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goto next1;
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}
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}
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/*NOTREACHED*/
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}
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starttok:
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for ( ; ; cp++) {
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c = *cp;
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if (c == '\0') {
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/* Token is finished. */
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*context = cp;
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break;
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}
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for (cp2 = delims; ; ) {
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c2 = (char) *cp2++;
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if (c2 == '\0') {
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/* This character was not a delimiter.
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* Keep it as part of current token.
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*/
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break;
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}
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if (c2 == c) {
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/* This char was a delimiter. */
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/* End of token. */
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*cp++ = '\0';
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*context = cp;
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return (start);
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}
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}
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}
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return (start);
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} /* strtokc */
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/* Same as strtokc, only you specify the destination buffer to write
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* the token in along with its size. strntokc will write to the dst
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* buffer, always nul-terminating it.
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*
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* It also returns the length of the token, or zero if there was no
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* token. This differs from strtokc, which returns a pointer to the
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* token or NULL for no token.
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*/
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int
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strntokc(char *dstTokenStart, size_t tokenSize, char *parsestr, const char *delims, char **context)
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{
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char *cp;
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const char *cp2;
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char c, c2;
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char *start;
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int len;
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char *dst, *lim;
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dst = dstTokenStart;
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lim = dst + tokenSize - 1; /* Leave room for nul byte. */
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if (parsestr == NULL)
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start = *context;
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else
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start = parsestr;
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if ((start == NULL) || (delims == NULL)) {
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*context = NULL;
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goto done;
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}
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/* Eat leading delimiters. */
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for (cp = start; ; ) {
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next1:
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c = *cp++;
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if (c == '\0') {
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/* No more tokens. */
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*context = NULL;
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goto done;
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}
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for (cp2 = delims; ; ) {
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c2 = (char) *cp2++;
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if (c2 == '\0') {
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/* This character was not a delimiter.
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* The token starts here.
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*/
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start = cp - 1;
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if (dst < lim)
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*dst++ = c;
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goto starttok;
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}
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if (c2 == c) {
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/* This char was a delimiter. */
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/* Skip it, look at next character. */
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goto next1;
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}
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}
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/*NOTREACHED*/
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}
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starttok:
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for ( ; ; cp++) {
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c = *cp;
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if (c == '\0') {
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/* Token is finished. */
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*context = cp;
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break;
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}
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for (cp2 = delims; ; ) {
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c2 = (char) *cp2++;
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if (c2 == '\0') {
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/* This character was not a delimiter.
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* Keep it as part of current token.
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*/
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break;
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}
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if (c2 == c) {
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/* This char was a delimiter. */
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/* End of token. */
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*cp++ = '\0';
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*context = cp;
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goto done;
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}
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}
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if (dst < lim) /* Don't overrun token size. */
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*dst++ = c;
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}
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done:
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*dst = '\0';
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len = (int) (dst - dstTokenStart); /* Return length of token. */
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#if (STRN_ZERO_PAD == 1)
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/* Pad with zeros. */
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for (++dst; dst <= lim; )
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*dst++ = 0;
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#endif /* STRN_ZERO_PAD */
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return (len);
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} /* strntokc */
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#ifdef TESTING_STRTOK
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#include <stdio.h>
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void
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main(int argc, char **argv)
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{
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char buf[256];
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int i;
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char *t;
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char token[8];
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int tokenLen;
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char *context;
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if (argc < 3) {
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fprintf(stderr, "Usage: test \"buffer,with,delims\" <delimiters>\n");
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exit(1);
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}
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strcpy(buf, argv[1]);
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i = 1;
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t = strtok(buf, argv[2]);
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if (t == NULL)
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exit(0);
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do {
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printf("strtok %d=[%s] length=%d\n", i, t, (int) strlen(t));
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t = strtok(NULL, argv[2]);
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++i;
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} while (t != NULL);
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printf("------------------------------------------------\n");
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strcpy(buf, argv[1]);
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i = 1;
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t = strtokc(buf, argv[2], &context);
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if (t == NULL)
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exit(0);
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do {
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printf("strtokc %d=[%s] length=%d\n", i, t, (int) strlen(t));
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t = strtokc(NULL, argv[2], &context);
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++i;
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} while (t != NULL);
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printf("------------------------------------------------\n");
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strcpy(buf, argv[1]);
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i = 1;
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tokenLen = strntokc(token, sizeof(token), buf, argv[2], &context);
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if (tokenLen <= 0)
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exit(0);
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do {
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printf("strntokc %d=[%s] length=%d\n", i, token, tokenLen);
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tokenLen = strntokc(token, sizeof(token), NULL, argv[2], &context);
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++i;
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} while (tokenLen > 0);
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exit(0);
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}
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#endif
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