src/common/header.c

#ifndef lint
static const char       RCSid[] = "$Id: header.c,v 2.14 2003/06/07 12:50:20 schorsch 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>

#define  MAXLINE        512

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

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

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

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, &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:	2.15
Committed:	Fri Jun 20 00:25:49 2003 UTC (20 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.14:	+1 -3 lines
Log Message:	Changed instances of "int4" to "int32" and "int2" to "int16"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.15	static const char RCSid[] = "$Id: header.c,v 2.14 2003/06/07 12:50:20 schorsch 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	2.14
34	greg	2.3	#define MAXLINE 512
35	greg	2.2
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	2.11	char TMSTR[] = "CAPDATE="; /* capture date identifier */
41
42			static int mycheck();
43	greg	2.4
44	greg	2.11
45			void
46	greg	2.4	newheader(s, fp) /* identifying line of information header */
47			char *s;
48			register FILE *fp;
49			{
50			fputs(HDRSTR, fp);
51			fputs(s, fp);
52			putc('\n', fp);
53			}
54
55
56	greg	2.5	int
57	greg	2.4	headidval(r,s) /* get header id (return true if is id) */
58			register char r, s;
59			{
60			register char *cp = HDRSTR;
61
62			while (cp) if (cp++ != *s++) return(0);
63			if (r == NULL) return(1);
64	gregl	2.9	while (s && !isspace(s)) r++ = s++;
65	greg	2.4	*r = '\0';
66			return(1);
67			}
68
69
70	greg	2.5	int
71	greg	2.4	isheadid(s) /* check to see if line is header id */
72			char *s;
73			{
74			return(headidval(NULL, s));
75			}
76
77
78	greg	2.11	int
79			dateval(tloc, s) /* get capture date value */
80			time_t *tloc;
81			char *s;
82			{
83			struct tm tms;
84			register char *cp = TMSTR;
85
86			while (cp) if (cp++ != *s++) return(0);
87			while (isspace(*s)) s++;
88			if (!*s) return(0);
89			if (sscanf(s, "%d:%d:%d %d:%d:%d",
90			&tms.tm_year, &tms.tm_mon, &tms.tm_mday,
91			&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6)
92			return(0);
93			if (tloc == NULL)
94			return(1);
95			tms.tm_mon--;
96			tms.tm_year -= 1900;
97			tms.tm_isdst = -1; /* ask mktime() to figure out DST */
98			*tloc = mktime(&tms);
99			return(1);
100			}
101
102
103			int
104			isdate(s) /* is the given line a capture date? */
105			char *s;
106			{
107			return(dateval(NULL, s));
108			}
109
110
111			void
112			fputdate(tv, fp) /* write out the given time value */
113			time_t tv;
114			FILE *fp;
115			{
116			struct tm *tm = localtime(&tv);
117			if (tm == NULL)
118			return;
119			fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR,
120			tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
121			tm->tm_hour, tm->tm_min, tm->tm_sec);
122			}
123
124
125			void
126			fputnow(fp) /* write out the current time */
127			FILE *fp;
128			{
129			time_t tv;
130			time(&tv);
131			fputdate(tv, fp);
132			}
133
134
135			void
136	greg	1.1	printargs(ac, av, fp) /* print arguments to a file */
137			int ac;
138			char **av;
139	greg	2.11	FILE *fp;
140	greg	1.1	{
141			while (ac-- > 0) {
142	greg	2.11	fputword(*av++, fp);
143			fputc(ac ? ' ' : '\n', fp);
144	greg	1.1	}
145			}
146
147
148	greg	2.5	int
149	greg	2.4	formatval(r, s) /* get format value (return true if format) */
150	greg	1.2	register char *r;
151			register char *s;
152			{
153	greg	2.4	register char *cp = FMTSTR;
154
155			while (cp) if (cp++ != *s++) return(0);
156	greg	1.3	while (isspace(*s)) s++;
157	greg	2.4	if (!*s) return(0);
158			if (r == NULL) return(1);
159	greg	2.5	do
160			r++ = s++;
161			while(s && !isspace(s));
162	greg	1.2	*r = '\0';
163	greg	2.4	return(1);
164	greg	1.2	}
165
166
167	greg	2.5	int
168	greg	2.4	isformat(s) /* is line a format line? */
169			char *s;
170			{
171			return(formatval(NULL, s));
172			}
173
174
175	greg	2.11	void
176	greg	1.2	fputformat(s, fp) /* put out a format value */
177			char *s;
178	greg	1.1	FILE *fp;
179	greg	1.2	{
180			fputs(FMTSTR, fp);
181			fputs(s, fp);
182			putc('\n', fp);
183			}
184
185
186	greg	2.5	int
187	greg	1.2	getheader(fp, f, p) /* get header from file */
188			FILE *fp;
189	greg	1.1	int (*f)();
190	greg	1.2	char *p;
191	greg	1.1	{
192			char buf[MAXLINE];
193
194			for ( ; ; ) {
195			buf[MAXLINE-2] = '\n';
196	greg	2.3	if (fgets(buf, MAXLINE, fp) == NULL)
197	greg	1.1	return(-1);
198			if (buf[0] == '\n')
199			return(0);
200	greg	2.3	#ifdef MSDOS
201			if (buf[0] == '\r' && buf[1] == '\n')
202			return(0);
203			#endif
204	greg	1.1	if (buf[MAXLINE-2] != '\n') {
205			ungetc(buf[MAXLINE-2], fp); /* prevent false end */
206			buf[MAXLINE-2] = '\0';
207			}
208	gwlarson	2.10	if (f != NULL && (*f)(buf, p) < 0)
209			return(-1);
210	greg	1.1	}
211			}
212
213
214	greg	1.2	struct check {
215			FILE *fp;
216	greg	1.3	char fs[64];
217	greg	1.2	};
218	greg	1.1
219	greg	1.2
220	greg	2.11	static int
221	greg	1.2	mycheck(s, cp) /* check a header line for format info. */
222	greg	1.1	char *s;
223	greg	1.2	register struct check *cp;
224	greg	1.1	{
225	greg	2.4	if (!formatval(cp->fs, s) && cp->fp != NULL)
226	greg	1.2	fputs(s, cp->fp);
227	greg	2.11	return(0);
228	greg	1.1	}
229
230
231	greg	2.5	int
232	greg	2.11	globmatch(p, s) /* check for match of s against pattern p */
233			register char p, s;
234	greg	1.3	{
235	greg	2.11	int setmatch;
236	greg	1.3
237			do {
238			switch (*p) {
239			case '?': /* match any character */
240			if (!*s++)
241			return(0);
242			break;
243			case '': / match any string */
244			while (p[1] == '*') p++;
245			do
246	greg	2.6	if ( (p[1]=='?' \|\| p[1]==*s) &&
247			globmatch(p+1,s) )
248	greg	1.3	return(1);
249			while (*s++);
250			return(0);
251	greg	2.11	case '[': /* character set */
252			setmatch = s == ++p;
253			if (!*p)
254			return(0);
255			while (*++p != ']') {
256			if (!*p)
257			return(0);
258			if (*p == '-') {
259			setmatch += p[-1] <= s && s <= p[1];
260			if (!*++p)
261			break;
262			} else
263			setmatch += p == s;
264			}
265			if (!setmatch)
266			return(0);
267			s++;
268			break;
269	greg	1.3	case '\\': /* literal next */
270			p++;
271			/* fall through */
272			default: /* normal character */
273			if (p != s)
274			return(0);
275			s++;
276			break;
277			}
278			} while (*p++);
279			return(1);
280			}
281
282
283			/*
284			* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
285			* matches the specification in fmt, 0 if no input format was found,
286			* and -1 if the input format does not match or there is an
287	greg	1.4	* error reading the header. If fmt is empty, then -1 is returned
288	greg	1.3	* if any input format is found (or there is an error), and 0 otherwise.
289			* If fmt contains any '*' or '?' characters, then checkheader
290			* does wildcard expansion and copies a matching result into fmt.
291	greg	2.7	* Be sure that fmt is big enough to hold the match in such cases,
292			* and that it is not a static, read-only string!
293	greg	1.3	* The input header (minus any format lines) is copied to fout
294			* if fout is not NULL.
295			*/
296
297	greg	2.5	int
298	greg	1.3	checkheader(fin, fmt, fout)
299	greg	1.2	FILE *fin;
300			char *fmt;
301			FILE *fout;
302	greg	1.1	{
303	greg	1.2	struct check cdat;
304	greg	2.7	register char *cp;
305	greg	1.2
306			cdat.fp = fout;
307			cdat.fs[0] = '\0';
308			if (getheader(fin, mycheck, &cdat) < 0)
309	greg	1.3	return(-1);
310	greg	2.6	if (!cdat.fs[0])
311			return(0);
312	greg	2.7	for (cp = fmt; cp; cp++) / check for globbing */
313			if (cp == '?' \| cp == '*')
314			if (globmatch(fmt, cdat.fs)) {
315			strcpy(fmt, cdat.fs);
316			return(1);
317			} else
318			return(-1);
319			return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */
320	greg	1.1	}