src/common/words.c

#ifndef lint
static const char RCSid[] = "$Id: words.c,v 2.9 2004/09/28 17:54:18 greg Exp $";
#endif
/*
 * Routines for recognizing and moving about words in strings.
 *
 * External symbols declared in standard.h
 */

#include "copyright.h"

#include  <ctype.h>
#include  <string.h>

#include  "rtio.h"

char *
atos(char *rs, int nb, char *s)         /* get word from string, returning rs */
{
        register char  *cp = rs;

        while (isspace(*s))
                s++;
        while (--nb > 0 && *s && !isspace(*s))
                *cp++ = *s++;
        *cp = '\0';
        return(rs);
}


char *
nextword(char *cp, int nb, char *s)     /* get (quoted) word, returning new s */
{
        int     quote = 0;

        if (s == NULL) return(NULL);
        while (isspace(*s))
                s++;
        switch (*s) {
        case '\0':
                return(NULL);
        case '"':
        case '\'':
                quote = *s++;
        }
        while (--nb > 0 && *s && (quote ? *s!=quote : !isspace(*s)))
                *cp++ = *s++;
        *cp = '\0';
        if (quote && *s==quote)
                s++;
        return(s);
}


char *
sskip(char *s)                  /* skip word in string, leaving on space */
{
        while (isspace(*s))
                s++;
        while (*s && !isspace(*s))
                s++;
        return(s);
}


char *
sskip2(char *s, int n)          /* skip word(s) in string, leaving on word */
{
        while (isspace(*s))
                s++;
        while (n-- > 0) {
                while (*s && !isspace(*s))
                        s++;
                while (isspace(*s))
                        s++;
        }
        return(s);
}


char *
iskip(char *s)                  /* skip integer in string */
{
        while (isspace(*s))
                s++;
        if (*s == '-' || *s == '+')
                s++;
        if (!isdigit(*s))
                return(NULL);
        do
                s++;
        while (isdigit(*s));
        return(s);
}


char *
fskip(char *s)                  /* skip float in string */
{
        register char  *cp;

        while (isspace(*s))
                s++;
        if (*s == '-' || *s == '+')
                s++;
        cp = s;
        while (isdigit(*cp))
                cp++;
        if (*cp == '.') {
                cp++; s++;
                while (isdigit(*cp))
                        cp++;
        }
        if (cp == s)
                return(NULL);
        if (*cp == 'e' || *cp == 'E')
                return(iskip(cp+1));
        return(cp);
}


int
isint(char *s)                  /* check integer format */
{
        register char  *cp;

        cp = iskip(s);
        return(cp != NULL && *cp == '\0');
}


int
isintd(char *s, char *ds)       /* check integer format with delimiter set */
{
        register char  *cp;

        cp = iskip(s);
        return(cp != NULL && strchr(ds, *cp) != NULL);
}


int
isflt(char *s)                  /* check float format */
{
        register char  *cp;

        cp = fskip(s);
        return(cp != NULL && *cp == '\0');
}


int
isfltd(char *s, char *ds)       /* check integer format with delimiter set */
{
        register char  *cp;

        cp = fskip(s);
        return(cp != NULL && strchr(ds, *cp) != NULL);
}


int
isname(char *s)                 /* check for legal identifier name */
{
        while (*s == '_')                       /* skip leading underscores */
                s++;
        if (!isascii(*s) || !isalpha(*s))       /* start with a letter */
                return(0);
        while (isascii(*++s) && isgraph(*s))    /* all visible characters */
                ;
        return(*s == '\0');                     /* ending in nul */
}
Revision:	2.10
Committed:	Fri Feb 18 00:40:25 2011 UTC (13 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.9:	+24 -26 lines
Log Message:	Major code reorg, moving mgflib to common and introducing BSDF material
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id: words.c,v 2.9 2004/09/28 17:54:18 greg Exp $";
3	#endif
4	/*
5	* Routines for recognizing and moving about words in strings.
6	*
7	* External symbols declared in standard.h
8	*/
9
10	#include "copyright.h"
11
12	#include <ctype.h>
13	#include <string.h>
14
15	#include "rtio.h"
16
17	char *
18	atos(char rs, int nb, char s) /* get word from string, returning rs */
19	{
20	register char *cp = rs;
21
22	while (isspace(*s))
23	s++;
24	while (--nb > 0 && s && !isspace(s))
25	cp++ = s++;
26	*cp = '\0';
27	return(rs);
28	}
29
30
31	char *
32	nextword(char cp, int nb, char s) /* get (quoted) word, returning new s */
33	{
34	int quote = 0;
35
36	if (s == NULL) return(NULL);
37	while (isspace(*s))
38	s++;
39	switch (*s) {
40	case '\0':
41	return(NULL);
42	case '"':
43	case '\'':
44	quote = *s++;
45	}
46	while (--nb > 0 && s && (quote ? s!=quote : !isspace(*s)))
47	cp++ = s++;
48	*cp = '\0';
49	if (quote && *s==quote)
50	s++;
51	return(s);
52	}
53
54
55	char *
56	sskip(char s) / skip word in string, leaving on space */
57	{
58	while (isspace(*s))
59	s++;
60	while (s && !isspace(s))
61	s++;
62	return(s);
63	}
64
65
66	char *
67	sskip2(char s, int n) / skip word(s) in string, leaving on word */
68	{
69	while (isspace(*s))
70	s++;
71	while (n-- > 0) {
72	while (s && !isspace(s))
73	s++;
74	while (isspace(*s))
75	s++;
76	}
77	return(s);
78	}
79
80
81	char *
82	iskip(char s) / skip integer in string */
83	{
84	while (isspace(*s))
85	s++;
86	if (s == '-' \|\| s == '+')
87	s++;
88	if (!isdigit(*s))
89	return(NULL);
90	do
91	s++;
92	while (isdigit(*s));
93	return(s);
94	}
95
96
97	char *
98	fskip(char s) / skip float in string */
99	{
100	register char *cp;
101
102	while (isspace(*s))
103	s++;
104	if (s == '-' \|\| s == '+')
105	s++;
106	cp = s;
107	while (isdigit(*cp))
108	cp++;
109	if (*cp == '.') {
110	cp++; s++;
111	while (isdigit(*cp))
112	cp++;
113	}
114	if (cp == s)
115	return(NULL);
116	if (cp == 'e' \|\| cp == 'E')
117	return(iskip(cp+1));
118	return(cp);
119	}
120
121
122	int
123	isint(char s) / check integer format */
124	{
125	register char *cp;
126
127	cp = iskip(s);
128	return(cp != NULL && *cp == '\0');
129	}
130
131
132	int
133	isintd(char s, char ds) /* check integer format with delimiter set */
134	{
135	register char *cp;
136
137	cp = iskip(s);
138	return(cp != NULL && strchr(ds, *cp) != NULL);
139	}
140
141
142	int
143	isflt(char s) / check float format */
144	{
145	register char *cp;
146
147	cp = fskip(s);
148	return(cp != NULL && *cp == '\0');
149	}
150
151
152	int
153	isfltd(char s, char ds) /* check integer format with delimiter set */
154	{
155	register char *cp;
156
157	cp = fskip(s);
158	return(cp != NULL && strchr(ds, *cp) != NULL);
159	}
160
161
162	int
163	isname(char s) / check for legal identifier name */
164	{
165	while (s == '_') / skip leading underscores */
166	s++;
167	if (!isascii(s) \|\| !isalpha(s)) /* start with a letter */
168	return(0);
169	while (isascii(++s) && isgraph(s)) /* all visible characters */
170	;
171	return(s == '\0'); / ending in nul */
172	}