| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: words.c,v 1.4 2003/03/11 17:08:55 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for recognizing and moving about words in strings. |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <string.h> |
| 9 |
#include <ctype.h> |
| 10 |
|
| 11 |
|
| 12 |
char * |
| 13 |
iskip(s) /* skip integer in string */ |
| 14 |
register char *s; |
| 15 |
{ |
| 16 |
while (isspace(*s)) |
| 17 |
s++; |
| 18 |
if (*s == '-' || *s == '+') |
| 19 |
s++; |
| 20 |
if (!isdigit(*s)) |
| 21 |
return(NULL); |
| 22 |
do |
| 23 |
s++; |
| 24 |
while (isdigit(*s)); |
| 25 |
return(s); |
| 26 |
} |
| 27 |
|
| 28 |
|
| 29 |
char * |
| 30 |
fskip(s) /* skip float in string */ |
| 31 |
register char *s; |
| 32 |
{ |
| 33 |
register char *cp; |
| 34 |
|
| 35 |
while (isspace(*s)) |
| 36 |
s++; |
| 37 |
if (*s == '-' || *s == '+') |
| 38 |
s++; |
| 39 |
cp = s; |
| 40 |
while (isdigit(*cp)) |
| 41 |
cp++; |
| 42 |
if (*cp == '.') { |
| 43 |
cp++; s++; |
| 44 |
while (isdigit(*cp)) |
| 45 |
cp++; |
| 46 |
} |
| 47 |
if (cp == s) |
| 48 |
return(NULL); |
| 49 |
if (*cp == 'e' || *cp == 'E') |
| 50 |
return(iskip(cp+1)); |
| 51 |
return(cp); |
| 52 |
} |
| 53 |
|
| 54 |
|
| 55 |
int |
| 56 |
isint(s) /* check integer format */ |
| 57 |
char *s; |
| 58 |
{ |
| 59 |
register char *cp; |
| 60 |
|
| 61 |
cp = iskip(s); |
| 62 |
return(cp != NULL && *cp == '\0'); |
| 63 |
} |
| 64 |
|
| 65 |
|
| 66 |
int |
| 67 |
isintd(s, ds) /* check integer format with delimiter set */ |
| 68 |
char *s, *ds; |
| 69 |
{ |
| 70 |
register char *cp; |
| 71 |
|
| 72 |
cp = iskip(s); |
| 73 |
return(cp != NULL && strchr(ds, *cp) != NULL); |
| 74 |
} |
| 75 |
|
| 76 |
|
| 77 |
int |
| 78 |
isflt(s) /* check float format */ |
| 79 |
char *s; |
| 80 |
{ |
| 81 |
register char *cp; |
| 82 |
|
| 83 |
cp = fskip(s); |
| 84 |
return(cp != NULL && *cp == '\0'); |
| 85 |
} |
| 86 |
|
| 87 |
|
| 88 |
int |
| 89 |
isfltd(s, ds) /* check integer format with delimiter set */ |
| 90 |
char *s, *ds; |
| 91 |
{ |
| 92 |
register char *cp; |
| 93 |
|
| 94 |
cp = fskip(s); |
| 95 |
return(cp != NULL && strchr(ds, *cp) != NULL); |
| 96 |
} |
| 97 |
|
| 98 |
|
| 99 |
int |
| 100 |
isname(s) /* check for legal identifier name */ |
| 101 |
register char *s; |
| 102 |
{ |
| 103 |
while (*s == '_') /* skip leading underscores */ |
| 104 |
s++; |
| 105 |
if (!isascii(*s) || !isalpha(*s)) /* start with a letter */ |
| 106 |
return(0); |
| 107 |
while (isascii(*++s) && isgraph(*s)) /* all visible characters */ |
| 108 |
; |
| 109 |
return(*s == '\0'); /* ending in nul */ |
| 110 |
} |
