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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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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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|
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#include <string.h> |
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#include <ctype.h> |
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|
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#ifdef BSD |
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#define strchr index |
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#endif |
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|
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#define NULL 0 |
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|
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|
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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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|
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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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|
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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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|
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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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|
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cp = iskip(s); |
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return(cp != NULL && *cp == '\0'); |
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} |
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|
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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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|
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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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|
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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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|
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cp = fskip(s); |
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return(cp != NULL && *cp == '\0'); |
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} |
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|
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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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|
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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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|
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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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} |
