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#ifndef lint |
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static const char RCSid[] = "$Id: header.c,v 2.16 2003/06/27 06:53:21 greg Exp $"; |
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#endif |
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/* |
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* header.c - routines for reading and writing information headers. |
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* |
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* Externals declared in resolu.h |
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* |
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* newheader(t,fp) start new information header identified by string t |
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* isheadid(s) returns true if s is a header id line |
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* headidval(r,s) copy header identifier value in s to r |
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* dateval(t,s) get capture date value |
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* isdate(s) returns true if s is a date line |
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* fputdate(t,fp) put out the given capture date and time |
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* fputnow(fp) put out the current date and time |
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* printargs(ac,av,fp) print an argument list to fp, followed by '\n' |
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* isformat(s) returns true if s is of the form "FORMAT=*" |
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* formatval(r,s) copy the format value in s to r |
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* fputformat(s,fp) write "FORMAT=%s" to fp |
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* getheader(fp,f,p) read header from fp, calling f(s,p) on each line |
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* globmatch(pat, str) check for glob match of str against pat |
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* checkheader(i,p,o) check header format from i against p and copy to o |
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* |
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* To copy header from input to output, use getheader(fin, fputs, fout) |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <string.h> |
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#include <time.h> |
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#include <ctype.h> |
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|
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#include "resolu.h" |
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|
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#define MAXLINE 512 |
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|
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char HDRSTR[] = "#?"; /* information header magic number */ |
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|
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char FMTSTR[] = "FORMAT="; /* format identifier */ |
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|
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char TMSTR[] = "CAPDATE="; /* capture date identifier */ |
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|
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extern void fputword(char *s, FILE *fp); |
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|
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static int mycheck(); |
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|
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|
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void |
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newheader(s, fp) /* identifying line of information header */ |
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char *s; |
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register FILE *fp; |
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{ |
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fputs(HDRSTR, fp); |
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fputs(s, fp); |
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putc('\n', fp); |
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} |
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|
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|
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int |
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headidval(r,s) /* get header id (return true if is id) */ |
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register char *r, *s; |
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{ |
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register char *cp = HDRSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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if (r == NULL) return(1); |
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while (*s && !isspace(*s)) *r++ = *s++; |
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*r = '\0'; |
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return(1); |
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} |
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|
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|
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int |
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isheadid(s) /* check to see if line is header id */ |
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char *s; |
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{ |
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return(headidval(NULL, s)); |
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} |
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|
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|
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int |
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dateval(tloc, s) /* get capture date value */ |
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time_t *tloc; |
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char *s; |
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{ |
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struct tm tms; |
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register char *cp = TMSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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while (isspace(*s)) s++; |
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if (!*s) return(0); |
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if (sscanf(s, "%d:%d:%d %d:%d:%d", |
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&tms.tm_year, &tms.tm_mon, &tms.tm_mday, |
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&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6) |
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return(0); |
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if (tloc == NULL) |
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return(1); |
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tms.tm_mon--; |
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tms.tm_year -= 1900; |
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tms.tm_isdst = -1; /* ask mktime() to figure out DST */ |
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*tloc = mktime(&tms); |
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return(1); |
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} |
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|
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|
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int |
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isdate(s) /* is the given line a capture date? */ |
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char *s; |
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{ |
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return(dateval(NULL, s)); |
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} |
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|
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|
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void |
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fputdate(tv, fp) /* write out the given time value */ |
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time_t tv; |
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FILE *fp; |
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{ |
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struct tm *tm = localtime(&tv); |
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if (tm == NULL) |
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return; |
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fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR, |
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tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, |
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tm->tm_hour, tm->tm_min, tm->tm_sec); |
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} |
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|
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|
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void |
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fputnow(fp) /* write out the current time */ |
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FILE *fp; |
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{ |
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time_t tv; |
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time(&tv); |
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fputdate(tv, fp); |
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} |
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|
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|
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void |
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printargs(ac, av, fp) /* print arguments to a file */ |
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int ac; |
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char **av; |
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FILE *fp; |
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{ |
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while (ac-- > 0) { |
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fputword(*av++, fp); |
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fputc(ac ? ' ' : '\n', fp); |
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} |
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} |
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|
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|
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int |
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formatval(r, s) /* get format value (return true if format) */ |
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register char *r; |
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register char *s; |
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{ |
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register char *cp = FMTSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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while (isspace(*s)) s++; |
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if (!*s) return(0); |
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if (r == NULL) return(1); |
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do |
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*r++ = *s++; |
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while(*s && !isspace(*s)); |
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*r = '\0'; |
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return(1); |
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} |
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|
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|
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int |
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isformat(s) /* is line a format line? */ |
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char *s; |
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{ |
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return(formatval(NULL, s)); |
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} |
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|
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|
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void |
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fputformat(s, fp) /* put out a format value */ |
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char *s; |
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FILE *fp; |
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{ |
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fputs(FMTSTR, fp); |
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fputs(s, fp); |
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putc('\n', fp); |
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} |
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|
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|
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int |
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getheader(fp, f, p) /* get header from file */ |
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FILE *fp; |
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int (*f)(); |
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char *p; |
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{ |
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char buf[MAXLINE]; |
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|
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for ( ; ; ) { |
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buf[MAXLINE-2] = '\n'; |
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if (fgets(buf, MAXLINE, fp) == NULL) |
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return(-1); |
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if (buf[0] == '\n') |
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return(0); |
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#ifdef MSDOS |
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if (buf[0] == '\r' && buf[1] == '\n') |
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return(0); |
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#endif |
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if (buf[MAXLINE-2] != '\n') { |
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ungetc(buf[MAXLINE-2], fp); /* prevent false end */ |
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buf[MAXLINE-2] = '\0'; |
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} |
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if (f != NULL && (*f)(buf, p) < 0) |
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return(-1); |
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} |
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} |
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|
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|
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struct check { |
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FILE *fp; |
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char fs[64]; |
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}; |
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|
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|
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static int |
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mycheck(s, cp) /* check a header line for format info. */ |
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char *s; |
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register struct check *cp; |
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{ |
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if (!formatval(cp->fs, s) && cp->fp != NULL) |
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fputs(s, cp->fp); |
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return(0); |
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} |
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|
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|
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int |
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globmatch(p, s) /* check for match of s against pattern p */ |
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register char *p, *s; |
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{ |
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int setmatch; |
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|
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do { |
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switch (*p) { |
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case '?': /* match any character */ |
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if (!*s++) |
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return(0); |
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break; |
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case '*': /* match any string */ |
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while (p[1] == '*') p++; |
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do |
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if ( (p[1]=='?' || p[1]==*s) && |
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globmatch(p+1,s) ) |
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return(1); |
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while (*s++); |
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return(0); |
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case '[': /* character set */ |
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setmatch = *s == *++p; |
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if (!*p) |
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return(0); |
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while (*++p != ']') { |
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if (!*p) |
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return(0); |
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if (*p == '-') { |
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setmatch += p[-1] <= *s && *s <= p[1]; |
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if (!*++p) |
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break; |
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} else |
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setmatch += *p == *s; |
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} |
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if (!setmatch) |
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return(0); |
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s++; |
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break; |
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case '\\': /* literal next */ |
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p++; |
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/* fall through */ |
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default: /* normal character */ |
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if (*p != *s) |
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return(0); |
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s++; |
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break; |
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} |
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} while (*p++); |
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return(1); |
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} |
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|
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|
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/* |
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* Checkheader(fin,fmt,fout) returns a value of 1 if the input format |
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* matches the specification in fmt, 0 if no input format was found, |
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* and -1 if the input format does not match or there is an |
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* error reading the header. If fmt is empty, then -1 is returned |
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* if any input format is found (or there is an error), and 0 otherwise. |
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* If fmt contains any '*' or '?' characters, then checkheader |
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* does wildcard expansion and copies a matching result into fmt. |
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* Be sure that fmt is big enough to hold the match in such cases, |
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* and that it is not a static, read-only string! |
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* The input header (minus any format lines) is copied to fout |
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* if fout is not NULL. |
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*/ |
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|
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int |
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checkheader(fin, fmt, fout) |
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FILE *fin; |
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char *fmt; |
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FILE *fout; |
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{ |
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struct check cdat; |
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register char *cp; |
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|
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cdat.fp = fout; |
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cdat.fs[0] = '\0'; |
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if (getheader(fin, mycheck, (char *)&cdat) < 0) |
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return(-1); |
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if (!cdat.fs[0]) |
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return(0); |
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for (cp = fmt; *cp; cp++) /* check for globbing */ |
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if (*cp == '?' | *cp == '*') |
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if (globmatch(fmt, cdat.fs)) { |
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strcpy(fmt, cdat.fs); |
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return(1); |
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} else |
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return(-1); |
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return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */ |
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} |
