src/common/header.c

/* Copyright (c) 1994 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  header.c - routines for reading and writing information headers.
 *
 *      8/19/88
 *
 *  newheader(t,fp)     start new information header identified by string t
 *  isheadid(s)         returns true if s is a header id line
 *  headidval(r,s)      copy header identifier value in s to r
 *  printargs(ac,av,fp) print an argument list to fp, followed by '\n'
 *  isformat(s)         returns true if s is of the form "FORMAT=*"
 *  formatval(r,s)      copy the format value in s to r
 *  fputformat(s,fp)    write "FORMAT=%s" to fp
 *  getheader(fp,f,p)   read header from fp, calling f(s,p) on each line
 *  globmatch(pat, str) check for glob match of str against pat
 *  checkheader(i,p,o)  check header format from i against p and copy to o
 *
 *  To copy header from input to output, use getheader(fin, fputs, fout)
 */

#include  <stdio.h>
#include  <ctype.h>

#define  MAXLINE        512

#ifndef BSD
#define  index  strchr
#endif

extern char  *index();

char  HDRSTR[] = "#?";          /* information header magic number */

char  FMTSTR[] = "FORMAT=";     /* format identifier */


newheader(s, fp)                /* identifying line of information header */
char  *s;
register FILE  *fp;
{
        fputs(HDRSTR, fp);
        fputs(s, fp);
        putc('\n', fp);
}


int
headidval(r,s)                  /* get header id (return true if is id) */
register char  *r, *s;
{
        register char  *cp = HDRSTR;

        while (*cp) if (*cp++ != *s++) return(0);
        if (r == NULL) return(1);
        while (*s) *r++ = *s++;
        *r = '\0';
        return(1);
}


int
isheadid(s)                     /* check to see if line is header id */
char  *s;
{
        return(headidval(NULL, s));
}


printargs(ac, av, fp)           /* print arguments to a file */
int  ac;
char  **av;
register FILE  *fp;
{
        int  quote;

        while (ac-- > 0) {
                if (index(*av, ' ') != NULL) {          /* quote it */
                        if (index(*av, '\'') != NULL)
                                quote = '"';
                        else
                                quote = '\'';
                        putc(quote, fp);
                        fputs(*av++, fp);
                        putc(quote, fp);
                } else
                        fputs(*av++, fp);
                putc(' ', fp);
        }
        putc('\n', fp);
}


int
formatval(r, s)                 /* get format value (return true if format) */
register char  *r;
register char  *s;
{
        register char  *cp = FMTSTR;

        while (*cp) if (*cp++ != *s++) return(0);
        while (isspace(*s)) s++;
        if (!*s) return(0);
        if (r == NULL) return(1);
        do
                *r++ = *s++;
        while(*s && !isspace(*s));
        *r = '\0';
        return(1);
}


int
isformat(s)                     /* is line a format line? */
char  *s;
{
        return(formatval(NULL, s));
}


fputformat(s, fp)               /* put out a format value */
char  *s;
FILE  *fp;
{
        fputs(FMTSTR, fp);
        fputs(s, fp);
        putc('\n', fp);
}


int
getheader(fp, f, p)             /* get header from file */
FILE  *fp;
int  (*f)();
char  *p;
{
        char  buf[MAXLINE];

        for ( ; ; ) {
                buf[MAXLINE-2] = '\n';
                if (fgets(buf, MAXLINE, fp) == NULL)
                        return(-1);
                if (buf[0] == '\n')
                        return(0);
#ifdef MSDOS
                if (buf[0] == '\r' && buf[1] == '\n')
                        return(0);
#endif
                if (buf[MAXLINE-2] != '\n') {
                        ungetc(buf[MAXLINE-2], fp);     /* prevent false end */
                        buf[MAXLINE-2] = '\0';
                }
                if (f != NULL)
                        (*f)(buf, p);
        }
}


struct check {
        FILE    *fp;
        char    fs[64];
};


static
mycheck(s, cp)                  /* check a header line for format info. */
char  *s;
register struct check  *cp;
{
        if (!formatval(cp->fs, s) && cp->fp != NULL)
                fputs(s, cp->fp);
}


int
globmatch(pat, str)             /* check for glob match of str against pat */
char    *pat, *str;
{
        register char   *p = pat, *s = str;

        do {
                switch (*p) {
                case '?':                       /* match any character */
                        if (!*s++)
                                return(0);
                        break;
                case '*':                       /* match any string */
                        while (p[1] == '*') p++;
                        do
                                if ( (p[1]=='?' || p[1]==*s) &&
                                                globmatch(p+1,s) )
                                        return(1);
                        while (*s++);
                        return(0);
                case '\\':                      /* literal next */
                        p++;
                /* fall through */
                default:                        /* normal character */
                        if (*p != *s)
                                return(0);
                        s++;
                        break;
                }
        } while (*p++);
        return(1);
}


/*
 * Checkheader(fin,fmt,fout) returns a value of 1 if the input format
 * matches the specification in fmt, 0 if no input format was found,
 * and -1 if the input format does not match or there is an
 * error reading the header.  If fmt is empty, then -1 is returned
 * if any input format is found (or there is an error), and 0 otherwise.
 * If fmt contains any '*' or '?' characters, then checkheader
 * does wildcard expansion and copies a matching result into fmt.
 * Be sure that fmt is big enough to hold the match in such cases,
 * and that it is not a static, read-only string!
 * The input header (minus any format lines) is copied to fout
 * if fout is not NULL.
 */

int
checkheader(fin, fmt, fout)
FILE  *fin;
char  *fmt;
FILE  *fout;
{
        struct check    cdat;
        register char   *cp;

        cdat.fp = fout;
        cdat.fs[0] = '\0';
        if (getheader(fin, mycheck, &cdat) < 0)
                return(-1);
        if (!cdat.fs[0])
                return(0);
        for (cp = fmt; *cp; cp++)               /* check for globbing */
                if (*cp == '?' | *cp == '*')
                        if (globmatch(fmt, cdat.fs)) {
                                strcpy(fmt, cdat.fs);
                                return(1);
                        } else
                                return(-1);
        return(strcmp(fmt, cdat.fs) ? -1 : 1);  /* literal match */
}
Revision:	2.7
Committed:	Tue Mar 12 11:29:16 1996 UTC (29 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+11 -6 lines
Log Message:	fixed bug on machines that put static strings in read-only memory
#	User	Rev	Content
1	greg	2.4	/* Copyright (c) 1994 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* header.c - routines for reading and writing information headers.
9			*
10			* 8/19/88
11	greg	1.3	*
12	greg	2.4	* newheader(t,fp) start new information header identified by string t
13			* isheadid(s) returns true if s is a header id line
14			* headidval(r,s) copy header identifier value in s to r
15	greg	2.3	* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
16	greg	1.3	* isformat(s) returns true if s is of the form "FORMAT=*"
17			* formatval(r,s) copy the format value in s to r
18			* fputformat(s,fp) write "FORMAT=%s" to fp
19			* getheader(fp,f,p) read header from fp, calling f(s,p) on each line
20	greg	2.6	* globmatch(pat, str) check for glob match of str against pat
21	greg	1.3	* checkheader(i,p,o) check header format from i against p and copy to o
22			*
23			* To copy header from input to output, use getheader(fin, fputs, fout)
24	greg	1.1	*/
25
26			#include <stdio.h>
27	greg	1.3	#include <ctype.h>
28	greg	1.1
29	greg	2.3	#define MAXLINE 512
30	greg	1.1
31	greg	2.2	#ifndef BSD
32	greg	2.3	#define index strchr
33	greg	2.2	#endif
34
35			extern char *index();
36
37	greg	2.4	char HDRSTR[] = "#?"; /* information header magic number */
38	greg	1.2
39	greg	2.4	char FMTSTR[] = "FORMAT="; /* format identifier */
40	greg	1.2
41	greg	2.4
42			newheader(s, fp) /* identifying line of information header */
43			char *s;
44			register FILE *fp;
45			{
46			fputs(HDRSTR, fp);
47			fputs(s, fp);
48			putc('\n', fp);
49			}
50
51
52	greg	2.5	int
53	greg	2.4	headidval(r,s) /* get header id (return true if is id) */
54			register char r, s;
55			{
56			register char *cp = HDRSTR;
57
58			while (cp) if (cp++ != *s++) return(0);
59			if (r == NULL) return(1);
60			while (s) r++ = *s++;
61			*r = '\0';
62			return(1);
63			}
64
65
66	greg	2.5	int
67	greg	2.4	isheadid(s) /* check to see if line is header id */
68			char *s;
69			{
70			return(headidval(NULL, s));
71			}
72
73
74	greg	1.1	printargs(ac, av, fp) /* print arguments to a file */
75			int ac;
76			char **av;
77	greg	2.2	register FILE *fp;
78	greg	1.1	{
79	greg	2.2	int quote;
80
81	greg	1.1	while (ac-- > 0) {
82	greg	2.2	if (index(av, ' ') != NULL) { / quote it */
83			if (index(*av, '\'') != NULL)
84			quote = '"';
85			else
86			quote = '\'';
87			putc(quote, fp);
88			fputs(*av++, fp);
89			putc(quote, fp);
90			} else
91			fputs(*av++, fp);
92	greg	1.1	putc(' ', fp);
93			}
94			putc('\n', fp);
95			}
96
97
98	greg	2.5	int
99	greg	2.4	formatval(r, s) /* get format value (return true if format) */
100	greg	1.2	register char *r;
101			register char *s;
102			{
103	greg	2.4	register char *cp = FMTSTR;
104
105			while (cp) if (cp++ != *s++) return(0);
106	greg	1.3	while (isspace(*s)) s++;
107	greg	2.4	if (!*s) return(0);
108			if (r == NULL) return(1);
109	greg	2.5	do
110			r++ = s++;
111			while(s && !isspace(s));
112	greg	1.2	*r = '\0';
113	greg	2.4	return(1);
114	greg	1.2	}
115
116
117	greg	2.5	int
118	greg	2.4	isformat(s) /* is line a format line? */
119			char *s;
120			{
121			return(formatval(NULL, s));
122			}
123
124
125	greg	1.2	fputformat(s, fp) /* put out a format value */
126			char *s;
127	greg	1.1	FILE *fp;
128	greg	1.2	{
129			fputs(FMTSTR, fp);
130			fputs(s, fp);
131			putc('\n', fp);
132			}
133
134
135	greg	2.5	int
136	greg	1.2	getheader(fp, f, p) /* get header from file */
137			FILE *fp;
138	greg	1.1	int (*f)();
139	greg	1.2	char *p;
140	greg	1.1	{
141			char buf[MAXLINE];
142
143			for ( ; ; ) {
144			buf[MAXLINE-2] = '\n';
145	greg	2.3	if (fgets(buf, MAXLINE, fp) == NULL)
146	greg	1.1	return(-1);
147			if (buf[0] == '\n')
148			return(0);
149	greg	2.3	#ifdef MSDOS
150			if (buf[0] == '\r' && buf[1] == '\n')
151			return(0);
152			#endif
153	greg	1.1	if (buf[MAXLINE-2] != '\n') {
154			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
155			buf[MAXLINE-2] = '\0';
156			}
157			if (f != NULL)
158	greg	1.2	(*f)(buf, p);
159	greg	1.1	}
160			}
161
162
163	greg	1.2	struct check {
164			FILE *fp;
165	greg	1.3	char fs[64];
166	greg	1.2	};
167	greg	1.1
168	greg	1.2
169	greg	1.1	static
170	greg	1.2	mycheck(s, cp) /* check a header line for format info. */
171	greg	1.1	char *s;
172	greg	1.2	register struct check *cp;
173	greg	1.1	{
174	greg	2.4	if (!formatval(cp->fs, s) && cp->fp != NULL)
175	greg	1.2	fputs(s, cp->fp);
176	greg	1.1	}
177
178
179	greg	2.5	int
180	greg	2.6	globmatch(pat, str) /* check for glob match of str against pat */
181	greg	1.3	char pat, str;
182			{
183			register char p = pat, s = str;
184
185			do {
186			switch (*p) {
187			case '?': /* match any character */
188			if (!*s++)
189			return(0);
190			break;
191			case '': / match any string */
192			while (p[1] == '*') p++;
193			do
194	greg	2.6	if ( (p[1]=='?' \|\| p[1]==*s) &&
195			globmatch(p+1,s) )
196	greg	1.3	return(1);
197			while (*s++);
198			return(0);
199			case '\\': /* literal next */
200			p++;
201			/* fall through */
202			default: /* normal character */
203			if (p != s)
204			return(0);
205			s++;
206			break;
207			}
208			} while (*p++);
209			return(1);
210			}
211
212
213			/*
214			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
215			* matches the specification in fmt, 0 if no input format was found,
216			* and -1 if the input format does not match or there is an
217	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
218	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
219			* If fmt contains any '*' or '?' characters, then checkheader
220			* does wildcard expansion and copies a matching result into fmt.
221	greg	2.7	* Be sure that fmt is big enough to hold the match in such cases,
222			* and that it is not a static, read-only string!
223	greg	1.3	* The input header (minus any format lines) is copied to fout
224			* if fout is not NULL.
225			*/
226
227	greg	2.5	int
228	greg	1.3	checkheader(fin, fmt, fout)
229	greg	1.2	FILE *fin;
230			char *fmt;
231			FILE *fout;
232	greg	1.1	{
233	greg	1.2	struct check cdat;
234	greg	2.7	register char *cp;
235	greg	1.2
236			cdat.fp = fout;
237			cdat.fs[0] = '\0';
238			if (getheader(fin, mycheck, &cdat) < 0)
239	greg	1.3	return(-1);
240	greg	2.6	if (!cdat.fs[0])
241			return(0);
242	greg	2.7	for (cp = fmt; cp; cp++) / check for globbing */
243			if (cp == '?' \| cp == '*')
244			if (globmatch(fmt, cdat.fs)) {
245			strcpy(fmt, cdat.fs);
246			return(1);
247			} else
248			return(-1);
249			return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */
250	greg	1.1	}