FreeCalypso > hg > themwi-system-sw
view libutil/numstring.c @ 69:8cf85edca543
sip-in: implement SIP ACK handling
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 19 Sep 2022 14:55:57 -0800 |
parents | d712d518059e |
children |
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/* * Utility functions for number string initial parsing or preening. * grok_number_string() checks whether or not a user-supplied string * argument is fully numeric (with possibility of allowing hyphens), * and returns the number of digits. dehyphen_number_string() copies * a possibly-hyphenated number string to a new buffer with all hyphens * taken out. */ #include <ctype.h> grok_number_string(str, allow_hyphen) char *str; { char *cp; int c, n, last_hyphen; n = 0; last_hyphen = 0; for (cp = str; *cp; ) { c = *cp++; if (isdigit(c)) { n++; last_hyphen = 0; } else if (c == '-') { if (!allow_hyphen || !n || last_hyphen) return(-1); last_hyphen = 1; } else return(-1); } if (last_hyphen) return(-1); return n; } dehyphen_number_string(src, dest) char *src, *dest; { char *cp, *dp; int c; dp = dest; for (cp = src; *cp; ) { c = *cp++; if (isdigit(c)) *dp++ = c; } *dp = '\0'; }