src/common/header.c

/* Copyright (c) 1991 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
 *
 *  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

char  FMTSTR[] = "FORMAT=";
int  FMTSTRL = 7;


printargs(ac, av, fp)           /* print arguments to a file */
int  ac;
char  **av;
FILE  *fp;
{
        while (ac-- > 0) {
                fputs(*av++, fp);
                putc(' ', fp);
        }
        putc('\n', fp);
}


isformat(s)                     /* is line a format line? */
char  *s;
{
        return(!strncmp(s,FMTSTR,FMTSTRL));
}


formatval(r, s)                 /* return format value */
register char  *r;
register char  *s;
{
        s += FMTSTRL;
        while (isspace(*s)) s++;
        if (!*s) { *r = '\0'; return; }
        while(*s) *r++ = *s++;
        while (isspace(r[-1])) r--;
        *r = '\0';
}


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, sizeof(buf), fp) == NULL)
                        return(-1);
                if (buf[0] == '\n')
                        return(0);
                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 (!strncmp(s,FMTSTR,FMTSTRL))
                formatval(cp->fs, s);
        else if (cp->fp != NULL)        /* don't copy format info. */
                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:	1.4
Committed:	Mon Apr 22 08:23:10 1991 UTC (33 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+3 -5 lines
Log Message:	minor change to checkheader.c
#	User	Rev	Content
1	greg	1.4	/* Copyright (c) 1991 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			* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
13			* isformat(s) returns true if s is of the form "FORMAT=*"
14			* formatval(r,s) copy the format value in s to r
15			* fputformat(s,fp) write "FORMAT=%s" to fp
16			* getheader(fp,f,p) read header from fp, calling f(s,p) on each line
17			* checkheader(i,p,o) check header format from i against p and copy to o
18			*
19			* To copy header from input to output, use getheader(fin, fputs, fout)
20	greg	1.1	*/
21
22			#include <stdio.h>
23	greg	1.3	#include <ctype.h>
24	greg	1.1
25	greg	1.2	#define MAXLINE 512
26	greg	1.1
27	greg	1.2	char FMTSTR[] = "FORMAT=";
28			int FMTSTRL = 7;
29
30
31	greg	1.1	printargs(ac, av, fp) /* print arguments to a file */
32			int ac;
33			char **av;
34			FILE *fp;
35			{
36			while (ac-- > 0) {
37			fputs(*av++, fp);
38			putc(' ', fp);
39			}
40			putc('\n', fp);
41			}
42
43
44	greg	1.2	isformat(s) /* is line a format line? */
45			char *s;
46			{
47			return(!strncmp(s,FMTSTR,FMTSTRL));
48			}
49	greg	1.1
50	greg	1.2
51			formatval(r, s) /* return format value */
52			register char *r;
53			register char *s;
54			{
55			s += FMTSTRL;
56	greg	1.3	while (isspace(*s)) s++;
57			if (!s) { r = '\0'; return; }
58			while(s) r++ = *s++;
59			while (isspace(r[-1])) r--;
60	greg	1.2	*r = '\0';
61			}
62
63
64			fputformat(s, fp) /* put out a format value */
65			char *s;
66	greg	1.1	FILE *fp;
67	greg	1.2	{
68			fputs(FMTSTR, fp);
69			fputs(s, fp);
70			putc('\n', fp);
71			}
72
73
74			getheader(fp, f, p) /* get header from file */
75			FILE *fp;
76	greg	1.1	int (*f)();
77	greg	1.2	char *p;
78	greg	1.1	{
79			char buf[MAXLINE];
80
81			for ( ; ; ) {
82			buf[MAXLINE-2] = '\n';
83			if (fgets(buf, sizeof(buf), fp) == NULL)
84			return(-1);
85			if (buf[0] == '\n')
86			return(0);
87			if (buf[MAXLINE-2] != '\n') {
88			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
89			buf[MAXLINE-2] = '\0';
90			}
91			if (f != NULL)
92	greg	1.2	(*f)(buf, p);
93	greg	1.1	}
94			}
95
96
97	greg	1.2	struct check {
98			FILE *fp;
99	greg	1.3	char fs[64];
100	greg	1.2	};
101	greg	1.1
102	greg	1.2
103	greg	1.1	static
104	greg	1.2	mycheck(s, cp) /* check a header line for format info. */
105	greg	1.1	char *s;
106	greg	1.2	register struct check *cp;
107	greg	1.1	{
108	greg	1.2	if (!strncmp(s,FMTSTR,FMTSTRL))
109			formatval(cp->fs, s);
110			else if (cp->fp != NULL) /* don't copy format info. */
111			fputs(s, cp->fp);
112	greg	1.1	}
113
114
115	greg	1.3	/*
116			* Copymatch(pat,str) checks pat for wildcards, and
117			* copies str into pat if there is a match (returning true).
118			*/
119
120			#ifdef COPYMATCH
121			copymatch(pat, str)
122			char pat, str;
123			{
124			int docopy = 0;
125			register char p = pat, s = str;
126
127			do {
128			switch (*p) {
129			case '?': /* match any character */
130			if (!*s++)
131			return(0);
132			docopy++;
133			break;
134			case '': / match any string */
135			while (p[1] == '*') p++;
136			do
137	greg	1.4	if ( (p[1]=='?' \|\| p[1]==*s)
138	greg	1.3	&& copymatch(p+1,s) ) {
139			strcpy(pat, str);
140			return(1);
141			}
142			while (*s++);
143			return(0);
144			case '\\': /* literal next */
145			p++;
146			/* fall through */
147			default: /* normal character */
148			if (p != s)
149			return(0);
150			s++;
151			break;
152			}
153			} while (*p++);
154			if (docopy)
155			strcpy(pat, str);
156			return(1);
157			}
158			#else
159			#define copymatch(pat, s) (!strcmp(pat, s))
160			#endif
161
162
163			/*
164			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
165			* matches the specification in fmt, 0 if no input format was found,
166			* and -1 if the input format does not match or there is an
167	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
168	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
169			* If fmt contains any '*' or '?' characters, then checkheader
170			* does wildcard expansion and copies a matching result into fmt.
171			* Be sure that fmt is big enough to hold the match in such cases!
172			* The input header (minus any format lines) is copied to fout
173			* if fout is not NULL.
174			*/
175
176			checkheader(fin, fmt, fout)
177	greg	1.2	FILE *fin;
178			char *fmt;
179			FILE *fout;
180	greg	1.1	{
181	greg	1.2	struct check cdat;
182
183			cdat.fp = fout;
184			cdat.fs[0] = '\0';
185			if (getheader(fin, mycheck, &cdat) < 0)
186	greg	1.3	return(-1);
187			if (cdat.fs[0] != '\0')
188			return(copymatch(fmt, cdat.fs) ? 1 : -1);
189	greg	1.2	return(0);
190	greg	1.1	}