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Cx51 User's Guide

Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference Library Files Source Code Standard Types jmp_buf size_t va_list wchar_t Macros CBYTE CWORD DBYTE DWORD FARRAY FCARRAY FCVAR FVAR PBYTE PWORD XBYTE XWORD Routines By Category Buffer Manipulation Routines Character Routines Data Conversion Routines Intrinsic Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions 80c517.h absacc.h assert.h ctype.h float.h intrins.h limits.h math.h rtx51tny.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _chkfloat_ _crol_ _cror_ _getkey _irol_ _iror_ _lrol_ _lror_ _nop_ _pop_ _push_ _testbit_ _tolower _toupper abs acos acos517 asin asin517 assert atan atan2 atan517 atof atof517 atoi atol cabs calloc ceil cos cos517 cosh exp exp517 fabs floor fmod free getchar gets init_mempool isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs log log10 log10517 log517 longjmp malloc memccpy memchr memcmp memcpy memmove memset modf offsetof pow printf printf517 putchar puts rand realloc scanf scanf517 setjmp sin sin517 sinh sprintf sprintf517 sqrt sqrt517 srand sscanf sscanf517 strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strstr strtod strtod517 strtok strtol strtoul switchbank tan tan517 tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf Appendix


#include <string.h>

char *strtok (
  char *str,          /* string to scan & delimit */
  const char *set);   /* set of delimeters */

A sequence of calls to strtok split str into tokens. A token is a character sequence separated by a single character delimiter that is part of the string set.

On the first call str is a non-NULL string pointer whose first character is used as the starting location to scan for tokens.

The strtok function begins searching the string str for the first delimiter character that is part of set. This end of the token is automatically replaced by a null-character by the function, and the beginning of the token is returned by the function. The end location is a saved pointer for subsequent calls.

In subsequent calls, when str is a NULL pointer, the strtok function searches from the saved pointer and uses therefore position right after the end of last token as the new starting location for scanning. The token delimiters pointed to by set may be different from call to call.

Return Value

The strtok function returns a pointer to the first character of the next token from str. If there are no further tokens, a NULL pointer is returned.

Note that the contents of the string str are modified and broken into smaller strings (tokens).

#include <string.h>
#include <stdio.h> /* for printf */

void tst_strtok (void) {
  char *tok;

  tok = strtok ("This is a string of text", " \t\n");

  while (tok != NULL) {
    printf ("Token: %s\n", tok);
    tok = strtok (NULL, " \t\n");
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