src/common/header.c

/* Copyright (c) 1992 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

#ifndef BSD
#define  index  strchr
#endif

extern char  *index();

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


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);
}


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, 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 (!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:	2.3
Committed:	Thu Nov 12 16:20:09 1992 UTC (32 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+9 -5 lines
Log Message:	Changes for 32-bit PC port
#	User	Rev	Content
1	greg	2.3	/* Copyright (c) 1992 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	2.3	* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
13	greg	1.3	* 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	2.3	#define MAXLINE 512
26	greg	1.1
27	greg	2.2	#ifndef BSD
28	greg	2.3	#define index strchr
29	greg	2.2	#endif
30
31			extern char *index();
32
33	greg	1.2	char FMTSTR[] = "FORMAT=";
34			int FMTSTRL = 7;
35
36
37	greg	1.1	printargs(ac, av, fp) /* print arguments to a file */
38			int ac;
39			char **av;
40	greg	2.2	register FILE *fp;
41	greg	1.1	{
42	greg	2.2	int quote;
43
44	greg	1.1	while (ac-- > 0) {
45	greg	2.2	if (index(av, ' ') != NULL) { / quote it */
46			if (index(*av, '\'') != NULL)
47			quote = '"';
48			else
49			quote = '\'';
50			putc(quote, fp);
51			fputs(*av++, fp);
52			putc(quote, fp);
53			} else
54			fputs(*av++, fp);
55	greg	1.1	putc(' ', fp);
56			}
57			putc('\n', fp);
58			}
59
60
61	greg	1.2	isformat(s) /* is line a format line? */
62			char *s;
63			{
64			return(!strncmp(s,FMTSTR,FMTSTRL));
65			}
66	greg	1.1
67	greg	1.2
68			formatval(r, s) /* return format value */
69			register char *r;
70			register char *s;
71			{
72			s += FMTSTRL;
73	greg	1.3	while (isspace(*s)) s++;
74			if (!s) { r = '\0'; return; }
75			while(s) r++ = *s++;
76			while (isspace(r[-1])) r--;
77	greg	1.2	*r = '\0';
78			}
79
80
81			fputformat(s, fp) /* put out a format value */
82			char *s;
83	greg	1.1	FILE *fp;
84	greg	1.2	{
85			fputs(FMTSTR, fp);
86			fputs(s, fp);
87			putc('\n', fp);
88			}
89
90
91			getheader(fp, f, p) /* get header from file */
92			FILE *fp;
93	greg	1.1	int (*f)();
94	greg	1.2	char *p;
95	greg	1.1	{
96			char buf[MAXLINE];
97
98			for ( ; ; ) {
99			buf[MAXLINE-2] = '\n';
100	greg	2.3	if (fgets(buf, MAXLINE, fp) == NULL)
101	greg	1.1	return(-1);
102			if (buf[0] == '\n')
103			return(0);
104	greg	2.3	#ifdef MSDOS
105			if (buf[0] == '\r' && buf[1] == '\n')
106			return(0);
107			#endif
108	greg	1.1	if (buf[MAXLINE-2] != '\n') {
109			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
110			buf[MAXLINE-2] = '\0';
111			}
112			if (f != NULL)
113	greg	1.2	(*f)(buf, p);
114	greg	1.1	}
115			}
116
117
118	greg	1.2	struct check {
119			FILE *fp;
120	greg	1.3	char fs[64];
121	greg	1.2	};
122	greg	1.1
123	greg	1.2
124	greg	1.1	static
125	greg	1.2	mycheck(s, cp) /* check a header line for format info. */
126	greg	1.1	char *s;
127	greg	1.2	register struct check *cp;
128	greg	1.1	{
129	greg	1.2	if (!strncmp(s,FMTSTR,FMTSTRL))
130			formatval(cp->fs, s);
131			else if (cp->fp != NULL) /* don't copy format info. */
132			fputs(s, cp->fp);
133	greg	1.1	}
134
135
136	greg	1.3	/*
137			* Copymatch(pat,str) checks pat for wildcards, and
138			* copies str into pat if there is a match (returning true).
139			*/
140
141			#ifdef COPYMATCH
142			copymatch(pat, str)
143			char pat, str;
144			{
145			int docopy = 0;
146			register char p = pat, s = str;
147
148			do {
149			switch (*p) {
150			case '?': /* match any character */
151			if (!*s++)
152			return(0);
153			docopy++;
154			break;
155			case '': / match any string */
156			while (p[1] == '*') p++;
157			do
158	greg	1.4	if ( (p[1]=='?' \|\| p[1]==*s)
159	greg	1.3	&& copymatch(p+1,s) ) {
160			strcpy(pat, str);
161			return(1);
162			}
163			while (*s++);
164			return(0);
165			case '\\': /* literal next */
166			p++;
167			/* fall through */
168			default: /* normal character */
169			if (p != s)
170			return(0);
171			s++;
172			break;
173			}
174			} while (*p++);
175			if (docopy)
176			strcpy(pat, str);
177			return(1);
178			}
179			#else
180			#define copymatch(pat, s) (!strcmp(pat, s))
181			#endif
182
183
184			/*
185			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
186			* matches the specification in fmt, 0 if no input format was found,
187			* and -1 if the input format does not match or there is an
188	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
189	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
190			* If fmt contains any '*' or '?' characters, then checkheader
191			* does wildcard expansion and copies a matching result into fmt.
192			* Be sure that fmt is big enough to hold the match in such cases!
193			* The input header (minus any format lines) is copied to fout
194			* if fout is not NULL.
195			*/
196
197			checkheader(fin, fmt, fout)
198	greg	1.2	FILE *fin;
199			char *fmt;
200			FILE *fout;
201	greg	1.1	{
202	greg	1.2	struct check cdat;
203
204			cdat.fp = fout;
205			cdat.fs[0] = '\0';
206			if (getheader(fin, mycheck, &cdat) < 0)
207	greg	1.3	return(-1);
208			if (cdat.fs[0] != '\0')
209			return(copymatch(fmt, cdat.fs) ? 1 : -1);
210	greg	1.2	return(0);
211	greg	1.1	}