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
 *  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);
}


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);
}


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);
}


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);
        while(*s) *r++ = *s++;
        while (isspace(r[-1])) r--;
        *r = '\0';
        return(1);
}


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);
}


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);
}


/*
 * Copymatch(pat,str) checks pat for wildcards, and
 * copies str into pat if there is a match (returning true).
 */

#ifdef COPYMATCH
copymatch(pat, str)
char    *pat, *str;
{
        int     docopy = 0;
        register char   *p = pat, *s = str;

        do {
                switch (*p) {
                case '?':                       /* match any character */
                        if (!*s++)
                                return(0);
                        docopy++;
                        break;
                case '*':                       /* match any string */
                        while (p[1] == '*') p++;
                        do
                                if ( (p[1]=='?' || p[1]==*s)
                                                && copymatch(p+1,s) ) {
                                        strcpy(pat, str);
                                        return(1);
                                }
                        while (*s++);
                        return(0);
                case '\\':                      /* literal next */
                        p++;
                /* fall through */
                default:                        /* normal character */
                        if (*p != *s)
                                return(0);
                        s++;
                        break;
                }
        } while (*p++);
        if (docopy)
                strcpy(pat, str);
        return(1);
}
#else
#define copymatch(pat, s)       (!strcmp(pat, s))
#endif


/*
 * 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!
 * The input header (minus any format lines) is copied to fout
 * if fout is not NULL.
 */

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

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