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 (14 years, 8 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
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id: words.c,v 2.9 2004/09/28 17:54:18 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* Routines for recognizing and moving about words in strings.
6	greg	2.5	*
7			* External symbols declared in standard.h
8			*/
9
10	greg	2.6	#include "copyright.h"
11	greg	1.1
12			#include <ctype.h>
13	greg	2.5	#include <string.h>
14	greg	1.1
15	schorsch	2.8	#include "rtio.h"
16	greg	1.1
17			char *
18	greg	2.10	atos(char rs, int nb, char s) /* get word from string, returning rs */
19	greg	1.2	{
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	gwlarson	2.4	}
29
30
31			char *
32	greg	2.10	nextword(char cp, int nb, char s) /* get (quoted) word, returning new s */
33	gwlarson	2.4	{
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	greg	1.2	}
53
54
55			char *
56	greg	2.10	sskip(char s) / skip word in string, leaving on space */
57	greg	1.1	{
58			while (isspace(*s))
59			s++;
60			while (s && !isspace(s))
61	greg	2.2	s++;
62	greg	2.3	return(s);
63			}
64
65
66			char *
67	greg	2.10	sskip2(char s, int n) / skip word(s) in string, leaving on word */
68	greg	2.3	{
69	greg	2.2	while (isspace(*s))
70	greg	1.1	s++;
71	greg	2.3	while (n-- > 0) {
72			while (s && !isspace(s))
73			s++;
74			while (isspace(*s))
75			s++;
76			}
77	greg	1.1	return(s);
78			}
79
80
81			char *
82	greg	2.10	iskip(char s) / skip integer in string */
83	greg	1.1	{
84	greg	1.2	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	greg	1.1	}
95
96
97			char *
98	greg	2.10	fskip(char s) / skip float in string */
99	greg	1.1	{
100	greg	1.4	register char *cp;
101	greg	1.1
102	greg	1.4	while (isspace(*s))
103			s++;
104			if (s == '-' \|\| s == '+')
105			s++;
106			cp = s;
107	greg	1.1	while (isdigit(*cp))
108			cp++;
109			if (*cp == '.') {
110	greg	1.2	cp++; s++;
111	greg	1.1	while (isdigit(*cp))
112			cp++;
113			}
114	greg	1.2	if (cp == s)
115			return(NULL);
116	greg	1.1	if (cp == 'e' \|\| cp == 'E')
117			return(iskip(cp+1));
118			return(cp);
119			}
120
121
122	greg	2.5	int
123	greg	2.10	isint(char s) / check integer format */
124	greg	1.1	{
125			register char *cp;
126
127			cp = iskip(s);
128	greg	1.2	return(cp != NULL && *cp == '\0');
129	greg	1.1	}
130
131
132	greg	2.5	int
133	greg	2.10	isintd(char s, char ds) /* check integer format with delimiter set */
134	greg	1.1	{
135			register char *cp;
136
137			cp = iskip(s);
138	greg	1.3	return(cp != NULL && strchr(ds, *cp) != NULL);
139	greg	1.1	}
140
141
142	greg	2.5	int
143	greg	2.10	isflt(char s) / check float format */
144	greg	1.1	{
145			register char *cp;
146
147			cp = fskip(s);
148	greg	1.2	return(cp != NULL && *cp == '\0');
149	greg	1.1	}
150
151
152	greg	2.5	int
153	greg	2.10	isfltd(char s, char ds) /* check integer format with delimiter set */
154	greg	1.1	{
155			register char *cp;
156
157			cp = fskip(s);
158	greg	1.3	return(cp != NULL && strchr(ds, *cp) != NULL);
159	greg	1.1	}
160	greg	2.10
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			}