src/common/header.c

#ifndef lint
static const char       RCSid[] = "$Id: header.c,v 2.16 2003/06/27 06:53:21 greg Exp $";
#endif
/*
 *  header.c - routines for reading and writing information headers.
 *
 *  Externals declared in resolu.h
 *
 *  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
 *  dateval(t,s)        get capture date value
 *  isdate(s)           returns true if s is a date line
 *  fputdate(t,fp)      put out the given capture date and time
 *  fputnow(fp)         put out the current date and time
 *  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 "copyright.h"

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

#include "resolu.h"

#define  MAXLINE        512

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

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

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

extern void     fputword(char *s, FILE *fp);

static int mycheck();


void
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 && !isspace(*s)) *r++ = *s++;
        *r = '\0';
        return(1);
}


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


int
dateval(tloc, s)                /* get capture date value */
time_t  *tloc;
char    *s;
{
        struct tm       tms;
        register 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
isdate(s)                       /* is the given line a capture date? */
char *s;
{
        return(dateval(NULL, s));
}


void
fputdate(tv, fp)                /* write out the given time value */
time_t  tv;
FILE    *fp;
{
        struct tm       *tm = localtime(&tv);
        if (tm == NULL)
                return;
        fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR,
                        tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
                        tm->tm_hour, tm->tm_min, tm->tm_sec);
}


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


void
printargs(ac, av, fp)           /* print arguments to a file */
int  ac;
char  **av;
FILE  *fp;
{
        while (ac-- > 0) {
                fputword(*av++, fp);
                fputc(ac ? ' ' : '\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));
}


void
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) < 0)
                        return(-1);
        }
}


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


static int
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);
        return(0);
}


int
globmatch(p, s)                 /* check for match of s against pattern p */
register char   *p, *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(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, (char *)&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:	2.17
Committed:	Mon Jun 30 14:59:11 2003 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+3 -2 lines
Log Message:	Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.17	static const char RCSid[] = "$Id: header.c,v 2.16 2003/06/27 06:53:21 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* header.c - routines for reading and writing information headers.
6			*
7	greg	2.11	* Externals declared in resolu.h
8	greg	1.3	*
9	greg	2.4	* newheader(t,fp) start new information header identified by string t
10			* isheadid(s) returns true if s is a header id line
11			* headidval(r,s) copy header identifier value in s to r
12	greg	2.11	* dateval(t,s) get capture date value
13			* isdate(s) returns true if s is a date line
14			* fputdate(t,fp) put out the given capture date and time
15			* fputnow(fp) put out the current date and time
16	greg	2.3	* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
17	greg	1.3	* isformat(s) returns true if s is of the form "FORMAT=*"
18			* formatval(r,s) copy the format value in s to r
19			* fputformat(s,fp) write "FORMAT=%s" to fp
20			* getheader(fp,f,p) read header from fp, calling f(s,p) on each line
21	greg	2.6	* globmatch(pat, str) check for glob match of str against pat
22	greg	1.3	* checkheader(i,p,o) check header format from i against p and copy to o
23			*
24			* To copy header from input to output, use getheader(fin, fputs, fout)
25	greg	1.1	*/
26
27	greg	2.12	#include "copyright.h"
28	greg	2.11
29	greg	1.1	#include <stdio.h>
30	greg	2.11	#include <string.h>
31			#include <time.h>
32	greg	1.3	#include <ctype.h>
33	schorsch	2.17
34			#include "resolu.h"
35	schorsch	2.14
36	greg	2.3	#define MAXLINE 512
37	greg	2.2
38	greg	2.4	char HDRSTR[] = "#?"; /* information header magic number */
39	greg	1.2
40	greg	2.4	char FMTSTR[] = "FORMAT="; /* format identifier */
41	greg	1.2
42	greg	2.11	char TMSTR[] = "CAPDATE="; /* capture date identifier */
43
44	greg	2.16	extern void fputword(char s, FILE fp);
45
46	greg	2.11	static int mycheck();
47	greg	2.4
48	greg	2.11
49			void
50	greg	2.4	newheader(s, fp) /* identifying line of information header */
51			char *s;
52			register FILE *fp;
53			{
54			fputs(HDRSTR, fp);
55			fputs(s, fp);
56			putc('\n', fp);
57			}
58
59
60	greg	2.5	int
61	greg	2.4	headidval(r,s) /* get header id (return true if is id) */
62			register char r, s;
63			{
64			register char *cp = HDRSTR;
65
66			while (cp) if (cp++ != *s++) return(0);
67			if (r == NULL) return(1);
68	gregl	2.9	while (s && !isspace(s)) r++ = s++;
69	greg	2.4	*r = '\0';
70			return(1);
71			}
72
73
74	greg	2.5	int
75	greg	2.4	isheadid(s) /* check to see if line is header id */
76			char *s;
77			{
78			return(headidval(NULL, s));
79			}
80
81
82	greg	2.11	int
83			dateval(tloc, s) /* get capture date value */
84			time_t *tloc;
85			char *s;
86			{
87			struct tm tms;
88			register char *cp = TMSTR;
89
90			while (cp) if (cp++ != *s++) return(0);
91			while (isspace(*s)) s++;
92			if (!*s) return(0);
93			if (sscanf(s, "%d:%d:%d %d:%d:%d",
94			&tms.tm_year, &tms.tm_mon, &tms.tm_mday,
95			&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
96			return(0);
97			if (tloc == NULL)
98			return(1);
99			tms.tm_mon--;
100			tms.tm_year -= 1900;
101			tms.tm_isdst = -1; /* ask mktime() to figure out DST */
102			*tloc = mktime(&tms);
103			return(1);
104			}
105
106
107			int
108			isdate(s) /* is the given line a capture date? */
109			char *s;
110			{
111			return(dateval(NULL, s));
112			}
113
114
115			void
116			fputdate(tv, fp) /* write out the given time value */
117			time_t tv;
118			FILE *fp;
119			{
120			struct tm *tm = localtime(&tv);
121			if (tm == NULL)
122			return;
123			fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR,
124			tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
125			tm->tm_hour, tm->tm_min, tm->tm_sec);
126			}
127
128
129			void
130			fputnow(fp) /* write out the current time */
131			FILE *fp;
132			{
133			time_t tv;
134			time(&tv);
135			fputdate(tv, fp);
136			}
137
138
139			void
140	greg	1.1	printargs(ac, av, fp) /* print arguments to a file */
141			int ac;
142			char **av;
143	greg	2.11	FILE *fp;
144	greg	1.1	{
145			while (ac-- > 0) {
146	greg	2.11	fputword(*av++, fp);
147			fputc(ac ? ' ' : '\n', fp);
148	greg	1.1	}
149			}
150
151
152	greg	2.5	int
153	greg	2.4	formatval(r, s) /* get format value (return true if format) */
154	greg	1.2	register char *r;
155			register char *s;
156			{
157	greg	2.4	register char *cp = FMTSTR;
158
159			while (cp) if (cp++ != *s++) return(0);
160	greg	1.3	while (isspace(*s)) s++;
161	greg	2.4	if (!*s) return(0);
162			if (r == NULL) return(1);
163	greg	2.5	do
164			r++ = s++;
165			while(s && !isspace(s));
166	greg	1.2	*r = '\0';
167	greg	2.4	return(1);
168	greg	1.2	}
169
170
171	greg	2.5	int
172	greg	2.4	isformat(s) /* is line a format line? */
173			char *s;
174			{
175			return(formatval(NULL, s));
176			}
177
178
179	greg	2.11	void
180	greg	1.2	fputformat(s, fp) /* put out a format value */
181			char *s;
182	greg	1.1	FILE *fp;
183	greg	1.2	{
184			fputs(FMTSTR, fp);
185			fputs(s, fp);
186			putc('\n', fp);
187			}
188
189
190	greg	2.5	int
191	greg	1.2	getheader(fp, f, p) /* get header from file */
192			FILE *fp;
193	greg	1.1	int (*f)();
194	greg	1.2	char *p;
195	greg	1.1	{
196			char buf[MAXLINE];
197
198			for ( ; ; ) {
199			buf[MAXLINE-2] = '\n';
200	greg	2.3	if (fgets(buf, MAXLINE, fp) == NULL)
201	greg	1.1	return(-1);
202			if (buf[0] == '\n')
203			return(0);
204	greg	2.3	#ifdef MSDOS
205			if (buf[0] == '\r' && buf[1] == '\n')
206			return(0);
207			#endif
208	greg	1.1	if (buf[MAXLINE-2] != '\n') {
209			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
210			buf[MAXLINE-2] = '\0';
211			}
212	gwlarson	2.10	if (f != NULL && (*f)(buf, p) < 0)
213			return(-1);
214	greg	1.1	}
215			}
216
217
218	greg	1.2	struct check {
219			FILE *fp;
220	greg	1.3	char fs[64];
221	greg	1.2	};
222	greg	1.1
223	greg	1.2
224	greg	2.11	static int
225	greg	1.2	mycheck(s, cp) /* check a header line for format info. */
226	greg	1.1	char *s;
227	greg	1.2	register struct check *cp;
228	greg	1.1	{
229	greg	2.4	if (!formatval(cp->fs, s) && cp->fp != NULL)
230	greg	1.2	fputs(s, cp->fp);
231	greg	2.11	return(0);
232	greg	1.1	}
233
234
235	greg	2.5	int
236	greg	2.11	globmatch(p, s) /* check for match of s against pattern p */
237			register char p, s;
238	greg	1.3	{
239	greg	2.11	int setmatch;
240	greg	1.3
241			do {
242			switch (*p) {
243			case '?': /* match any character */
244			if (!*s++)
245			return(0);
246			break;
247			case '': / match any string */
248			while (p[1] == '*') p++;
249			do
250	greg	2.6	if ( (p[1]=='?' \|\| p[1]==*s) &&
251			globmatch(p+1,s) )
252	greg	1.3	return(1);
253			while (*s++);
254			return(0);
255	greg	2.11	case '[': /* character set */
256			setmatch = s == ++p;
257			if (!*p)
258			return(0);
259			while (*++p != ']') {
260			if (!*p)
261			return(0);
262			if (*p == '-') {
263			setmatch += p[-1] <= s && s <= p[1];
264			if (!*++p)
265			break;
266			} else
267			setmatch += p == s;
268			}
269			if (!setmatch)
270			return(0);
271			s++;
272			break;
273	greg	1.3	case '\\': /* literal next */
274			p++;
275			/* fall through */
276			default: /* normal character */
277			if (p != s)
278			return(0);
279			s++;
280			break;
281			}
282			} while (*p++);
283			return(1);
284			}
285
286
287			/*
288			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
289			* matches the specification in fmt, 0 if no input format was found,
290			* and -1 if the input format does not match or there is an
291	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
292	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
293			* If fmt contains any '*' or '?' characters, then checkheader
294			* does wildcard expansion and copies a matching result into fmt.
295	greg	2.7	* Be sure that fmt is big enough to hold the match in such cases,
296			* and that it is not a static, read-only string!
297	greg	1.3	* The input header (minus any format lines) is copied to fout
298			* if fout is not NULL.
299			*/
300
301	greg	2.5	int
302	greg	1.3	checkheader(fin, fmt, fout)
303	greg	1.2	FILE *fin;
304			char *fmt;
305			FILE *fout;
306	greg	1.1	{
307	greg	1.2	struct check cdat;
308	greg	2.7	register char *cp;
309	greg	1.2
310			cdat.fp = fout;
311			cdat.fs[0] = '\0';
312	greg	2.16	if (getheader(fin, mycheck, (char *)&cdat) < 0)
313	greg	1.3	return(-1);
314	greg	2.6	if (!cdat.fs[0])
315			return(0);
316	greg	2.7	for (cp = fmt; cp; cp++) / check for globbing */
317			if (cp == '?' \| cp == '*')
318			if (globmatch(fmt, cdat.fs)) {
319			strcpy(fmt, cdat.fs);
320			return(1);
321			} else
322			return(-1);
323			return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */
324	greg	1.1	}