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#ifndef lint |
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static const char RCSid[] = "$Id: words.c,v 2.12 2019/12/28 18:05:14 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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* External symbols declared in standard.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <ctype.h> |
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|
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#include "rtio.h" |
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|
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char * |
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atos(char *rs, int nb, char *s) /* get word from string, returning rs */ |
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{ |
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char *cp = rs; |
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|
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while (isspace(*s)) |
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s++; |
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while (--nb > 0 && *s && !isspace(*s)) |
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*cp++ = *s++; |
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*cp = '\0'; |
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return(rs); |
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} |
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|
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|
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char * |
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nextword(char *cp, int nb, char *s) /* get (quoted) word, returning new s */ |
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{ |
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int quote = 0; |
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|
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if (s == NULL) return(NULL); |
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while (isspace(*s)) |
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s++; |
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switch (*s) { |
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case '\0': |
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return(NULL); |
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case '"': |
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case '\'': |
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quote = *s++; |
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} |
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while (--nb > 0 && *s && (quote ? *s!=quote : !isspace(*s))) |
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*cp++ = *s++; |
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*cp = '\0'; |
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if (quote && *s==quote) |
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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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sskip(char *s) /* skip word in string, leaving on space */ |
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{ |
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while (isspace(*s)) |
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s++; |
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while (*s && !isspace(*s)) |
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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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sskip2(char *s, int n) /* skip word(s) in string, leaving on word */ |
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{ |
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while (isspace(*s)) |
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s++; |
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while (n-- > 0) { |
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while (*s && !isspace(*s)) |
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s++; |
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while (isspace(*s)) |
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s++; |
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} |
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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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iskip(char *s) /* skip integer in string */ |
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{ |
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while (isspace(*s)) |
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s++; |
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s += (*s == '-') | (*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(char *s) /* skip float in string */ |
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{ |
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char *cp; |
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|
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while (isspace(*s)) |
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s++; |
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s += (*s == '-') | (*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(isspace(*++cp) ? NULL : iskip(cp)); |
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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(char *s) /* check integer format */ |
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{ |
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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(char *s, char *ds) /* check integer format with delimiter set */ |
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{ |
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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(char *s) /* check float format */ |
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{ |
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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(char *s, char *ds) /* check integer format with delimiter set */ |
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{ |
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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(char *s) /* check for legal identifier name */ |
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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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} |
