81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
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/* hstring.c - Random string-related functions for hping.
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* Copyright(C) 2003 Salvatore Sanfilippo
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* All rights reserved */
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#include <sys/types.h>
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#include <string.h>
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#include <ctype.h>
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/* return 1 if the string looks like an integer number
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* otherwise 0 is returned.
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*
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* this function is equivalent to this regexp:
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* [:space:]*-{0,1}[0-9]+[:space:]*
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* in english:
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* (0-inf spaces)(zero or one -)(1-inf digits)(0-inf spaces)
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*/
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int strisnum(char *s)
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{
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int digits = 0; /* used to return false if there aren't digits */
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while(isspace(*s))
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s++; /* skip initial spaces */
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if (*s == '-') /* negative number? */
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s++;
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while(*s) {
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if (isspace(*s)) { /* skip spaces in the tail */
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while(isspace(*s))
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s++;
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if (*s) return 0; /* but don't allow other tail chars */
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return digits ? 1 : 0;
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}
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if (!isdigit(*s))
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return 0;
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s++;
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digits++;
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}
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return digits ? 1 : 0;
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}
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/* function similar to strtok() more convenient when we know the
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* max number of tokens, to tokenize with a single call.
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* Unlike strtok(), strftok() is thread safe.
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*
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* ARGS:
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* 'sep' is a string that contains all the delimiter characters
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* 'str' is the string to tokenize, that will be modified
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* 'tptrs' is an array of char* poiters that will contain the token pointers
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* 'nptrs' is the length of the 'tptrs' array.
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*
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* RETURN VALUE:
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* The number of extracted tokens is returned.
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*/
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size_t strftok(char *sep, char *str, char **tptrs, size_t nptrs)
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{
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size_t seplen = strlen(sep);
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size_t i, j = 0;
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int inside = 0;
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while(*str) {
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for(i = 0; i < seplen; i++) {
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if (sep[i] == *str)
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break;
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}
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if (i == seplen) { /* no match */
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if (!inside) {
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tptrs[j++] = str;
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inside = 1;
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}
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} else { /* match */
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if (inside) {
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*str = '\0';
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if (j == nptrs)
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return j;
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inside = 0;
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}
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}
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str++;
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}
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return j;
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}
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