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#ifndef lint
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static const char RCSid[] = "$Id: words.c,v 1.4 2003/03/11 17:08:55 greg Exp $";
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#endif
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/*
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* Routines for recognizing and moving about words in strings.
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*/
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#include <string.h>
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#include <ctype.h>
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char *
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iskip(s) /* skip integer in string */
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register char *s;
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{
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while (isspace(*s))
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s++;
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if (*s == '-' || *s == '+')
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s++;
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if (!isdigit(*s))
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return(NULL);
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do
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s++;
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while (isdigit(*s));
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return(s);
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}
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char *
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fskip(s) /* skip float in string */
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register char *s;
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{
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register char *cp;
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while (isspace(*s))
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s++;
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if (*s == '-' || *s == '+')
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s++;
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cp = s;
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while (isdigit(*cp))
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cp++;
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if (*cp == '.') {
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cp++; s++;
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while (isdigit(*cp))
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cp++;
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}
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if (cp == s)
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return(NULL);
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if (*cp == 'e' || *cp == 'E')
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return(iskip(cp+1));
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return(cp);
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}
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int
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isint(s) /* check integer format */
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char *s;
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{
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register char *cp;
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cp = iskip(s);
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return(cp != NULL && *cp == '\0');
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}
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int
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isintd(s, ds) /* check integer format with delimiter set */
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char *s, *ds;
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{
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register char *cp;
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cp = iskip(s);
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return(cp != NULL && strchr(ds, *cp) != NULL);
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}
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int
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isflt(s) /* check float format */
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char *s;
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{
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register char *cp;
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cp = fskip(s);
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return(cp != NULL && *cp == '\0');
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}
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int
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isfltd(s, ds) /* check integer format with delimiter set */
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char *s, *ds;
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{
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register char *cp;
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cp = fskip(s);
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return(cp != NULL && strchr(ds, *cp) != NULL);
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}
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int
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isname(s) /* check for legal identifier name */
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register char *s;
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{
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while (*s == '_') /* skip leading underscores */
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s++;
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if (!isascii(*s) || !isalpha(*s)) /* start with a letter */
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return(0);
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while (isascii(*++s) && isgraph(*s)) /* all visible characters */
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;
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return(*s == '\0'); /* ending in nul */
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}
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