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Strn
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Strntok.c
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C/C++ Source or Header
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2001-11-19
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4KB
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180 lines
#include "syshdrs.h"
#ifdef PRAGMA_HDRSTOP
# pragma hdrstop
#endif
/* This version of Strtok differs from the regular ANSI strtok in that
* an empty token can be returned, and consecutive delimiters are not
* ignored like ANSI does. Example:
*
* Parse String = ",,mike,gleason,-West Interactive,402-573-1000"
* Delimiters = ",-"
*
* (ANSI strtok:)
* strtok 1=[mike] length=4
* strtok 2=[gleason] length=7
* strtok 3=[West Interactive] length=16
* strtok 4=[402] length=3
* strtok 5=[573] length=3
* strtok 6=[1000] length=4
*
* (Strtok:)
* Strtok 1=[] length=0
* Strtok 2=[] length=0
* Strtok 3=[mike] length=4
* Strtok 4=[gleason] length=7
* Strtok 5=[] length=0
* Strtok 6=[West Interactive] length=16
* Strtok 7=[402] length=3
* Strtok 8=[573] length=3
* Strtok 9=[1000] length=4
*
*/
char *
Strtok(char *buf, const char *delims)
{
static char *p = NULL;
char *start, *end;
if (buf != NULL) {
p = buf;
} else {
if (p == NULL)
return (NULL); /* No more tokens. */
}
for (start = p, end = p; ; end++) {
if (*end == '\0') {
p = NULL; /* This is the last token. */
break;
}
if (strchr(delims, (int) *end) != NULL) {
*end++ = '\0';
p = end;
break;
}
}
return (start);
} /* Strtok */
/* This is a bounds-safe version of Strtok, where you also pass a pointer
* to the token to write into, and its size. Using the example above,
* with a char token[8], you get the following. Notice that the token
* is not overrun, and is always nul-terminated:
*
* Strntok 1=[] length=0
* Strntok 2=[] length=0
* Strntok 3=[mike] length=4
* Strntok 4=[gleason] length=7
* Strntok 5=[] length=0
* Strntok 6=[West In] length=7
* Strntok 7=[402] length=3
* Strntok 8=[573] length=3
* Strntok 9=[1000] length=4
*/
int
Strntok(char *dstTokenStart, size_t tokenSize, char *buf, const char *delims)
{
static char *p = NULL;
char *end;
char *lim;
char *dst;
int len;
dst = dstTokenStart;
lim = dst + tokenSize - 1; /* Leave room for nul byte. */
if (buf != NULL) {
p = buf;
} else {
if (p == NULL) {
*dst = '\0';
return (-1); /* No more tokens. */
}
}
for (end = p; ; end++) {
if (*end == '\0') {
p = NULL; /* This is the last token. */
break;
}
if (strchr(delims, (int) *end) != NULL) {
++end;
p = end;
break;
}
if (dst < lim) /* Don't overrun token size. */
*dst++ = *end;
}
*dst = '\0';
len = (int) (dst - dstTokenStart); /* Return length of token. */
#if (STRN_ZERO_PAD == 1)
/* Pad with zeros. */
for (++dst; dst <= lim; )
*dst++ = 0;
#endif /* STRN_ZERO_PAD */
return (len);
} /* Strntok */
#ifdef TESTING_STRTOK
#include <stdio.h>
void
main(int argc, char **argv)
{
char buf[256];
int i;
char *t;
char token[8];
int tokenLen;
if (argc < 3) {
fprintf(stderr, "Usage: test \"buffer,with,delims\" <delimiters>\n");
exit(1);
}
strcpy(buf, argv[1]);
i = 1;
t = strtok(buf, argv[2]);
if (t == NULL)
exit(0);
do {
printf("strtok %d=[%s] length=%d\n", i, t, (int) strlen(t));
t = strtok(NULL, argv[2]);
++i;
} while (t != NULL);
printf("------------------------------------------------\n");
strcpy(buf, argv[1]);
i = 1;
t = Strtok(buf, argv[2]);
if (t == NULL)
exit(0);
do {
printf("Strtok %d=[%s] length=%d\n", i, t, (int) strlen(t));
t = Strtok(NULL, argv[2]);
++i;
} while (t != NULL);
printf("------------------------------------------------\n");
strcpy(buf, argv[1]);
i = 1;
tokenLen = Strntok(token, sizeof(token), buf, argv[2]);
if (tokenLen < 0)
exit(0);
do {
printf("Strntok %d=[%s] length=%d\n", i, token, tokenLen);
tokenLen = Strntok(token, sizeof(token), NULL, argv[2]);
++i;
} while (tokenLen >= 0);
exit(0);
}
#endif