src/common/header.c

#ifndef lint
static const char       RCSid[] = "$Id: header.c,v 2.42 2022/03/03 15:43:04 greg Exp $";
#endif
/*
 *  header.c - routines for reading and writing information headers.
 *
 *  Externals declared in rtio.h
 *
 *  newheader(t,fp)     start new information header identified by string t
 *  headidval(r,s)      copy header identifier value in s to r
 *  dateval(t,s)        get capture date value as UTC
 *  gmtval(t,s)         get GMT as UTC
 *  fputdate(t,fp)      put out the given UTC
 *  fputnow(fp)         put out the current date and time
 *  printargs(ac,av,fp) print an argument list to fp, followed by '\n'
 *  formatval(r,s)      copy the format value in s to r
 *  fputformat(s,fp)    write "FORMAT=%s" to fp
 *  nativebigendian()   are we native on big-endian machine?
 *  isbigendian(s)      header line matches "BigEndian=1" (-1 if irrelevant)
 *  fputendian(fp)      write native endianness in BigEndian= line
 *  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 "copyright.h"

#include  <ctype.h>

#include  "tiff.h"      /* for int32 */
#include  "rtio.h"
#include  "resolu.h"

#define  MAXLINE        2048

extern time_t           timegm(struct tm *tm);

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

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

const char  TMSTR[] = "CAPDATE=";       /* capture date identifier */
const char  GMTSTR[] = "GMT=";          /* GMT identifier */

const char  BIGEND[] = "BigEndian=";    /* big-endian variable */

static gethfunc mycheck;


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


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

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


int
dateval(                /* convert capture date line to UTC */
        time_t  *tloc,
        const char      *s
)
{
        struct tm       tms;
        const char      *cp = TMSTR;

        while (*cp) if (*cp++ != *s++) return(0);
        while (isspace(*s)) s++;
        if (!*s) return(0);
        if (sscanf(s, "%d:%d:%d %d:%d:%d",
                        &tms.tm_year, &tms.tm_mon, &tms.tm_mday,
                        &tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
                return(0);
        if (tloc == NULL)
                return(1);
        tms.tm_mon--;
        tms.tm_year -= 1900;
        tms.tm_isdst = -1;      /* ask mktime() to figure out DST */
        *tloc = mktime(&tms);
        return(1);
}


int
gmtval(                 /* convert GMT date line to UTC */
        time_t  *tloc,
        const char      *s
)
{
        struct tm       tms;
        const char      *cp = GMTSTR;

        while (*cp) if (*cp++ != *s++) return(0);
        while (isspace(*s)) s++;
        if (!*s) return(0);
        if (sscanf(s, "%d:%d:%d %d:%d:%d",
                        &tms.tm_year, &tms.tm_mon, &tms.tm_mday,
                        &tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
                return(0);
        if (tloc == NULL)
                return(1);
        tms.tm_mon--;
        tms.tm_year -= 1900;
        *tloc = timegm(&tms);
        return(1);
}


void
fputdate(               /* write out the given time value (local & GMT) */
        time_t  tv,
        FILE    *fp
)
{
        struct tm       *tms;

        tms = localtime(&tv);
        if (tms != NULL)
                fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR,
                                tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday,
                                tms->tm_hour, tms->tm_min, tms->tm_sec);
        tms = gmtime(&tv);
        if (tms != NULL)
                fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", GMTSTR,
                                tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday,
                                tms->tm_hour, tms->tm_min, tms->tm_sec);
}


void
fputnow(                        /* write out the current time */
        FILE    *fp
)
{
        time_t  tv;
        time(&tv);
        fputdate(tv, fp);
}


void
printargs(              /* print arguments to a file */
        int  ac,
        char  **av,
        FILE  *fp
)
{
#if defined(_WIN32) || defined(_WIN64)
        extern char     *fixargv0(char *arg0);
        char            myav0[128];
                                /* clean up Windows executable path */
        if (ac-- <= 0) return;
        fputs(fixargv0(strcpy(myav0, *av++)), fp);
        fputc(ac ? ' ' : '\n', fp);
#endif
        while (ac-- > 0) {
                fputword(*av++, fp);
                fputc(ac ? ' ' : '\n', fp);
        }
}


int
formatval(                      /* get format value (return true if format) */
        char  fmt[MAXFMTLEN],
        const char  *s
)
{
        const char  *cp = FMTSTR;
        char  *r = fmt;

        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-fmt < MAXFMTLEN-1);
        *r = '\0';
        return(1);
}


void
fputformat(             /* put out a format value */
        const char  *s,
        FILE  *fp
)
{
        int     align = 0;

        fputs(FMTSTR, fp);
        fputs(s, fp);
                        /* pad to align binary type for mmap() */
        if (!strncmp(s, "float", 5))
                align = sizeof(float);
        else if (!strncmp(s, "double", 6))
                align = sizeof(double);
        else if (!strncmp(s, "16-bit", 6))
                align = 2;
        else if (!strncmp(s, "32-bit", 6))
                align = 4;
        else if (!strncmp(s, "64-bit", 6))
                align = 8;
        if (align) {
                long    pos = ftell(fp);
                if (pos >= 0) {
                        pos = (pos + 2) % align;
                        if (pos) align -= pos;
                        else align = 0;
                } else
                        align = 0;
        }
        while (align-- > 0)
                putc(' ', fp);
        fputc('\n', fp);
}


int
nativebigendian()       /* are we native on a big-endian machine? */
{
        union { int32 i; char c[4]; } u;

        u.i = 1;

        return(u.c[0] == 0);
}


int
isbigendian(            /* header line says "BigEndian=1" (-1 if irrelevant) */
        const char *s
)
{
        const char      *be = BIGEND;

        while ((*s != '\0') & (*be != '=') && *s++ == *be)
                ++be;
        if (*be != '=')
                return(-1);     /* irrelevant */
        while (isspace(*s))
                s++;
        if (*s++ != '=')
                return(-1);
        while (isspace(*s))
                s++;
        return(*s == '1');
}


void
fputendian(             /* write native endianness in BigEndian= line */
        FILE *fp
)
{
        fputs(BIGEND, fp);
        if (nativebigendian())
                fputs("1\n", fp);
        else
                fputs("0\n", fp);
}


int
getheader(              /* get header from file */
        FILE  *fp,
        gethfunc *f,
        void  *p
)
{
        int   rtotal = 0;
        char  buf[MAXLINE];
        int   firstc = fgetc(fp);

        if (!isprint(firstc))
                return(-1);                             /* messed up */
        ungetc(firstc, fp);
        for ( ; ; ) {
                int     rval = 0;
                buf[MAXLINE-2] = '\n';
                if (fgets(buf, MAXLINE, fp) == NULL)
                        return(-1);
                if (buf[buf[0]=='\r'] == '\n')          /* end of header? */
                        return(rtotal);
                if (buf[MAXLINE-2] != '\n') {
                        ungetc(buf[MAXLINE-2], fp);     /* prevent false end */
                        buf[MAXLINE-2] = '\0';
                }
                if (f != NULL && (rval = (*f)(buf, p)) < 0)
                        return(-1);
                rtotal += rval;
        }
}


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


static int
mycheck(                        /* check a header line for format info. */
        char  *s,
        void  *cp
)
{
        struct check    *scp = (struct check *)cp;

        if (!formatval(scp->fs, s) && scp->fp != NULL)
                return(fputs(s, scp->fp));

        return(0);
}


int
globmatch(                      /* check for match of s against pattern p */
        const char      *p,
        const char      *s
)
{
        int     setmatch;

        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 '[':                       /* character set */
                        setmatch = *s == *++p;
                        if (!*p)
                                return(0);
                        while (*++p != ']') {
                                if (!*p)
                                        return(0);
                                if (*p == '-') {
                                        setmatch += (p[-1] <= *s && *s <= p[1]);
                                        if (!*++p)
                                                break;
                                } else
                                        setmatch += (*p == *s);
                        }
                        if (!setmatch)
                                return(0);
                        s++;
                        break;
                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(
        FILE  *fin,
        char  fmt[MAXFMTLEN],
        FILE  *fout
)
{
        struct check    cdat;
        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:	2.43
Committed:	Fri Mar 4 17:16:12 2022 UTC (3 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.42:	+8 -4 lines
Log Message:	refactor: made fputformat() more accurate wrt types
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.43	static const char RCSid[] = "$Id: header.c,v 2.42 2022/03/03 15:43:04 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* header.c - routines for reading and writing information headers.
6			*
7	greg	2.35	* Externals declared in rtio.h
8	greg	1.3	*
9	greg	2.4	* newheader(t,fp) start new information header identified by string t
10			* headidval(r,s) copy header identifier value in s to r
11	greg	2.25	* dateval(t,s) get capture date value as UTC
12			* gmtval(t,s) get GMT as UTC
13			* fputdate(t,fp) put out the given UTC
14	greg	2.11	* fputnow(fp) put out the current date and time
15	greg	2.3	* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
16	greg	1.3	* formatval(r,s) copy the format value in s to r
17			* fputformat(s,fp) write "FORMAT=%s" to fp
18	greg	2.36	* nativebigendian() are we native on big-endian machine?
19			* isbigendian(s) header line matches "BigEndian=1" (-1 if irrelevant)
20			* fputendian(fp) write native endianness in BigEndian= line
21	greg	1.3	* getheader(fp,f,p) read header from fp, calling f(s,p) on each line
22	greg	2.6	* globmatch(pat, str) check for glob match of str against pat
23	greg	1.3	* checkheader(i,p,o) check header format from i against p and copy to o
24			*
25			* To copy header from input to output, use getheader(fin, fputs, fout)
26	greg	1.1	*/
27
28	greg	2.12	#include "copyright.h"
29	greg	2.11
30	greg	1.3	#include <ctype.h>
31	schorsch	2.17
32	greg	2.36	#include "tiff.h" /* for int32 */
33	greg	2.18	#include "rtio.h"
34			#include "resolu.h"
35	schorsch	2.14
36	greg	2.24	#define MAXLINE 2048
37	greg	2.2
38	greg	2.26	extern time_t timegm(struct tm *tm);
39
40	greg	2.25	const char HDRSTR[] = "#?"; /* information header magic number */
41	greg	1.2
42	greg	2.25	const char FMTSTR[] = "FORMAT="; /* format identifier */
43	greg	1.2
44	greg	2.25	const char TMSTR[] = "CAPDATE="; /* capture date identifier */
45			const char GMTSTR[] = "GMT="; /* GMT identifier */
46	greg	2.16
47	greg	2.36	const char BIGEND[] = "BigEndian="; /* big-endian variable */
48
49	schorsch	2.22	static gethfunc mycheck;
50	greg	2.4
51	greg	2.11
52	greg	2.29	void
53	schorsch	2.22	newheader( /* identifying line of information header */
54	greg	2.31	const char *s,
55	greg	2.25	FILE *fp
56	schorsch	2.22	)
57	greg	2.4	{
58			fputs(HDRSTR, fp);
59			fputs(s, fp);
60	greg	2.41	fputc('\n', fp);
61	greg	2.4	}
62
63
64	greg	2.29	int
65	schorsch	2.22	headidval( /* get header id (return true if is id) */
66	greg	2.25	char *r,
67	greg	2.31	const char *s
68	schorsch	2.22	)
69	greg	2.4	{
70	greg	2.25	const char *cp = HDRSTR;
71	greg	2.4
72			while (cp) if (cp++ != *s++) return(0);
73			if (r == NULL) return(1);
74	gregl	2.9	while (s && !isspace(s)) r++ = s++;
75	greg	2.4	*r = '\0';
76			return(1);
77			}
78
79
80	greg	2.29	int
81	greg	2.25	dateval( /* convert capture date line to UTC */
82	schorsch	2.22	time_t *tloc,
83	greg	2.31	const char *s
84	schorsch	2.22	)
85	greg	2.11	{
86			struct tm tms;
87	greg	2.25	const char *cp = TMSTR;
88	greg	2.11
89			while (cp) if (cp++ != *s++) return(0);
90			while (isspace(*s)) s++;
91			if (!*s) return(0);
92			if (sscanf(s, "%d:%d:%d %d:%d:%d",
93			&tms.tm_year, &tms.tm_mon, &tms.tm_mday,
94			&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
95			return(0);
96			if (tloc == NULL)
97			return(1);
98			tms.tm_mon--;
99			tms.tm_year -= 1900;
100			tms.tm_isdst = -1; /* ask mktime() to figure out DST */
101			*tloc = mktime(&tms);
102			return(1);
103			}
104
105
106	greg	2.29	int
107	greg	2.25	gmtval( /* convert GMT date line to UTC */
108			time_t *tloc,
109	greg	2.31	const char *s
110	schorsch	2.22	)
111	greg	2.11	{
112	greg	2.25	struct tm tms;
113			const char *cp = GMTSTR;
114
115			while (cp) if (cp++ != *s++) return(0);
116			while (isspace(*s)) s++;
117			if (!*s) return(0);
118			if (sscanf(s, "%d:%d:%d %d:%d:%d",
119			&tms.tm_year, &tms.tm_mon, &tms.tm_mday,
120			&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
121			return(0);
122			if (tloc == NULL)
123			return(1);
124			tms.tm_mon--;
125			tms.tm_year -= 1900;
126			*tloc = timegm(&tms);
127			return(1);
128	greg	2.11	}
129
130
131	greg	2.29	void
132	greg	2.25	fputdate( /* write out the given time value (local & GMT) */
133	schorsch	2.22	time_t tv,
134			FILE *fp
135			)
136	greg	2.11	{
137	greg	2.25	struct tm *tms;
138
139			tms = localtime(&tv);
140			if (tms != NULL)
141			fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR,
142			tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday,
143			tms->tm_hour, tms->tm_min, tms->tm_sec);
144			tms = gmtime(&tv);
145			if (tms != NULL)
146			fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", GMTSTR,
147			tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday,
148			tms->tm_hour, tms->tm_min, tms->tm_sec);
149	greg	2.11	}
150
151
152	greg	2.29	void
153	schorsch	2.22	fputnow( /* write out the current time */
154			FILE *fp
155			)
156	greg	2.11	{
157			time_t tv;
158			time(&tv);
159			fputdate(tv, fp);
160			}
161
162
163	greg	2.29	void
164	schorsch	2.22	printargs( /* print arguments to a file */
165			int ac,
166			char **av,
167			FILE *fp
168			)
169	greg	1.1	{
170	greg	2.39	#if defined(_WIN32) \|\| defined(_WIN64)
171			extern char fixargv0(char arg0);
172			char myav0[128];
173			/* clean up Windows executable path */
174	greg	2.40	if (ac-- <= 0) return;
175	greg	2.39	fputs(fixargv0(strcpy(myav0, *av++)), fp);
176	greg	2.40	fputc(ac ? ' ' : '\n', fp);
177	greg	2.39	#endif
178	greg	1.1	while (ac-- > 0) {
179	greg	2.11	fputword(*av++, fp);
180			fputc(ac ? ' ' : '\n', fp);
181	greg	1.1	}
182			}
183
184
185	greg	2.29	int
186	schorsch	2.22	formatval( /* get format value (return true if format) */
187	greg	2.32	char fmt[MAXFMTLEN],
188	greg	2.31	const char *s
189	schorsch	2.22	)
190	greg	1.2	{
191	greg	2.25	const char *cp = FMTSTR;
192	greg	2.32	char *r = fmt;
193	greg	2.4
194			while (cp) if (cp++ != *s++) return(0);
195	greg	1.3	while (isspace(*s)) s++;
196	greg	2.4	if (!*s) return(0);
197			if (r == NULL) return(1);
198	greg	2.5	do
199			r++ = s++;
200	greg	2.32	while (s && !isspace(s) && r-fmt < MAXFMTLEN-1);
201	greg	1.2	*r = '\0';
202	greg	2.4	return(1);
203	greg	1.2	}
204
205
206	greg	2.29	void
207	schorsch	2.22	fputformat( /* put out a format value */
208	greg	2.31	const char *s,
209	schorsch	2.22	FILE *fp
210			)
211	greg	1.2	{
212	greg	2.41	int align = 0;
213
214	greg	1.2	fputs(FMTSTR, fp);
215			fputs(s, fp);
216	greg	2.41	/* pad to align binary type for mmap() */
217	greg	2.43	if (!strncmp(s, "float", 5))
218			align = sizeof(float);
219			else if (!strncmp(s, "double", 6))
220			align = sizeof(double);
221			else if (!strncmp(s, "16-bit", 6))
222	greg	2.42	align = 2;
223	greg	2.43	else if (!strncmp(s, "32-bit", 6))
224	greg	2.41	align = 4;
225	greg	2.43	else if (!strncmp(s, "64-bit", 6))
226	greg	2.41	align = 8;
227			if (align) {
228			long pos = ftell(fp);
229			if (pos >= 0) {
230			pos = (pos + 2) % align;
231			if (pos) align -= pos;
232			else align = 0;
233			} else
234			align = 0;
235			}
236			while (align-- > 0)
237			putc(' ', fp);
238			fputc('\n', fp);
239	greg	1.2	}
240
241
242	greg	2.29	int
243	greg	2.36	nativebigendian() /* are we native on a big-endian machine? */
244			{
245			union { int32 i; char c[4]; } u;
246
247			u.i = 1;
248
249			return(u.c[0] == 0);
250			}
251
252
253			int
254			isbigendian( /* header line says "BigEndian=1" (-1 if irrelevant) */
255			const char *s
256			)
257			{
258			const char *be = BIGEND;
259
260	greg	2.37	while ((s != '\0') & (be != '=') && s++ == be)
261	greg	2.36	++be;
262			if (*be != '=')
263			return(-1); /* irrelevant */
264			while (isspace(*s))
265			s++;
266			if (*s++ != '=')
267			return(-1);
268			while (isspace(*s))
269			s++;
270			return(*s == '1');
271			}
272
273
274			void
275			fputendian( /* write native endianness in BigEndian= line */
276			FILE *fp
277			)
278			{
279			fputs(BIGEND, fp);
280			if (nativebigendian())
281			fputs("1\n", fp);
282			else
283			fputs("0\n", fp);
284			}
285
286
287			int
288	schorsch	2.22	getheader( /* get header from file */
289			FILE *fp,
290			gethfunc *f,
291			void *p
292			)
293	greg	1.1	{
294	greg	2.30	int rtotal = 0;
295	greg	1.1	char buf[MAXLINE];
296	greg	2.34	int firstc = fgetc(fp);
297	greg	1.1
298	greg	2.34	if (!isprint(firstc))
299			return(-1); /* messed up */
300			ungetc(firstc, fp);
301	greg	1.1	for ( ; ; ) {
302	greg	2.30	int rval = 0;
303	greg	1.1	buf[MAXLINE-2] = '\n';
304	greg	2.3	if (fgets(buf, MAXLINE, fp) == NULL)
305	greg	1.1	return(-1);
306	greg	2.34	if (buf[buf[0]=='\r'] == '\n') /* end of header? */
307	greg	2.30	return(rtotal);
308	greg	1.1	if (buf[MAXLINE-2] != '\n') {
309			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
310			buf[MAXLINE-2] = '\0';
311			}
312	greg	2.30	if (f != NULL && (rval = (*f)(buf, p)) < 0)
313	gwlarson	2.10	return(-1);
314	greg	2.30	rtotal += rval;
315	greg	1.1	}
316			}
317
318
319	greg	1.2	struct check {
320			FILE *fp;
321	greg	2.32	char fs[MAXFMTLEN];
322	greg	1.2	};
323	greg	1.1
324	greg	1.2
325	greg	2.11	static int
326	schorsch	2.22	mycheck( /* check a header line for format info. */
327			char *s,
328			void *cp
329			)
330			{
331	greg	2.33	struct check scp = (struct check )cp;
332
333			if (!formatval(scp->fs, s) && scp->fp != NULL)
334	greg	2.38	return(fputs(s, scp->fp));
335	greg	2.33
336	greg	2.11	return(0);
337	greg	1.1	}
338
339
340	greg	2.29	int
341	schorsch	2.22	globmatch( /* check for match of s against pattern p */
342	greg	2.31	const char *p,
343			const char *s
344	schorsch	2.22	)
345	greg	1.3	{
346	greg	2.11	int setmatch;
347	greg	1.3
348			do {
349			switch (*p) {
350			case '?': /* match any character */
351			if (!*s++)
352			return(0);
353			break;
354			case '': / match any string */
355			while (p[1] == '*') p++;
356			do
357	greg	2.28	if ( (p[1]=='?') \| (p[1]==*s) &&
358	greg	2.6	globmatch(p+1,s) )
359	greg	1.3	return(1);
360			while (*s++);
361			return(0);
362	greg	2.11	case '[': /* character set */
363			setmatch = s == ++p;
364			if (!*p)
365			return(0);
366			while (*++p != ']') {
367			if (!*p)
368			return(0);
369			if (*p == '-') {
370	greg	2.28	setmatch += (p[-1] <= s && s <= p[1]);
371	greg	2.11	if (!*++p)
372			break;
373			} else
374	greg	2.28	setmatch += (p == s);
375	greg	2.11	}
376			if (!setmatch)
377			return(0);
378			s++;
379			break;
380	greg	1.3	case '\\': /* literal next */
381			p++;
382			/* fall through */
383			default: /* normal character */
384			if (p != s)
385			return(0);
386			s++;
387			break;
388			}
389			} while (*p++);
390			return(1);
391			}
392
393
394			/*
395			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
396			* matches the specification in fmt, 0 if no input format was found,
397			* and -1 if the input format does not match or there is an
398	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
399	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
400			* If fmt contains any '*' or '?' characters, then checkheader
401			* does wildcard expansion and copies a matching result into fmt.
402	greg	2.7	* Be sure that fmt is big enough to hold the match in such cases,
403			* and that it is not a static, read-only string!
404	greg	1.3	* The input header (minus any format lines) is copied to fout
405			* if fout is not NULL.
406			*/
407
408	greg	2.29	int
409	schorsch	2.22	checkheader(
410			FILE *fin,
411	greg	2.32	char fmt[MAXFMTLEN],
412	schorsch	2.22	FILE *fout
413			)
414	greg	1.1	{
415	greg	1.2	struct check cdat;
416	greg	2.25	char *cp;
417	greg	1.2
418			cdat.fp = fout;
419			cdat.fs[0] = '\0';
420	schorsch	2.22	if (getheader(fin, mycheck, &cdat) < 0)
421	greg	1.3	return(-1);
422	greg	2.6	if (!cdat.fs[0])
423			return(0);
424	greg	2.7	for (cp = fmt; cp; cp++) / check for globbing */
425	schorsch	2.20	if ((cp == '?') \| (cp == '*')) {
426	greg	2.7	if (globmatch(fmt, cdat.fs)) {
427			strcpy(fmt, cdat.fs);
428			return(1);
429			} else
430			return(-1);
431	schorsch	2.19	}
432	greg	2.7	return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */
433	greg	1.1	}