plan9port

fork of plan9port with libvec, libstr and libsdb
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request.c (3903B)

      1 /*
      2  *
      3  * Things used to handle special requests (eg. manual feed) globally or on a per
      4  * page basis. Requests are passed through to the translator using the -R option.
      5  * The argument to -R can be "request", "request:page", or "request:page:file".
      6  * If page is omitted (as in the first form) or set to 0 request will be applied
      7  * to the global environment. In all other cases it applies only to the selected
      8  * page. If a file is given, page must be supplied, and the lookup is in that file
      9  * rather than *requestfile.
     10  *
     11  */
     12 
     13 #include <stdio.h>
     14 #include <stdlib.h>
     15 #include <string.h>
     16 #include <unistd.h>
     17 
     18 #include "gen.h"			/* general purpose definitions */
     19 #include "ext.h"
     20 #include "request.h"			/* a few special definitions */
     21 #include "path.h"			/* for the default request file */
     22 
     23 Request	request[MAXREQUEST];		/* next page or global request */
     24 int	nextreq = 0;			/* goes in request[nextreq] */
     25 char	*requestfile = REQUESTFILE;	/* default lookup file */
     26 
     27 void dumprequest(char *want, char *file, FILE *fp_out);
     28 extern void error(int errtype, char *fmt, ...);
     29 
     30 /*****************************************************************************/
     31 
     32 void
     33 saverequest(want)
     34 
     35     char	*want;			/* grab code for this stuff */
     36 
     37 {
     38 
     39     char	*page;			/* and save it for this page */
     40     char	*strtok();
     41 
     42 /*
     43  *
     44  * Save the request until we get to appropriate page - don't even bother with
     45  * the lookup right now. Format of *want string is "request", "request:page", or
     46  * "request:page:file", and we assume we can change the string here as needed.
     47  * If page is omitted or given as 0 the request will be done globally. If *want
     48  * includes a file, request and page must also be given, and in that case *file
     49  * will be used for the lookup.
     50  *
     51  */
     52 
     53     if ( nextreq < MAXREQUEST )  {
     54 	request[nextreq].want = strtok(want, ": ");
     55 	if ( (page = strtok(NULL, ": ")) == NULL )
     56 	    request[nextreq].page = 0;
     57 	else request[nextreq].page = atoi(page);
     58 	if ( (request[nextreq].file = strtok(NULL, ": ")) == NULL )
     59 	    request[nextreq].file = requestfile;
     60 	nextreq++;
     61     } else error(NON_FATAL, "too many requests - ignoring %s", want);
     62 
     63 }   /* End of saverequest */
     64 
     65 /*****************************************************************************/
     66 
     67 void
     68 writerequest(page, fp_out)
     69 
     70     int		page;			/* write everything for this page */
     71     FILE	*fp_out;		/* to this file */
     72 
     73 {
     74 
     75     int		i;			/* loop index */
     76 
     77 /*
     78  *
     79  * Writes out all the requests that have been saved for page. Page 0 refers to
     80  * the global environment and is done during initial setup.
     81  *
     82  */
     83 
     84     for ( i = 0; i < nextreq; i++ )
     85 	if ( request[i].page == page )
     86 	    dumprequest(request[i].want, request[i].file, fp_out);
     87 
     88 }   /* End of writerequest */
     89 
     90 /*****************************************************************************/
     91 
     92 void
     93 dumprequest(want, file, fp_out)
     94 
     95     char	*want;			/* look for this string */
     96     char	*file;			/* in this file */
     97     FILE	*fp_out;		/* and write the value out here */
     98 
     99 {
    100 
    101     char	buf[100];		/* line buffer for reading *file */
    102     FILE	*fp_in;
    103 
    104 /*
    105  *
    106  * Looks for *want in the request file and if it's found the associated value
    107  * is copied to the output file. Keywords (ie. the *want strings) begin an @ in
    108  * the first column of file, while the values (ie. the stuff that's copied to
    109  * the output file) starts on the next line and extends to the next keyword or
    110  * to the end of file.
    111  *
    112  */
    113 
    114     if ( (fp_in = fopen(file, "r")) != NULL )  {
    115 	while ( fgets(buf, sizeof(buf), fp_in) != NULL )
    116 	    if ( buf[0] == '@' && strncmp(want, &buf[1], strlen(want)) == 0 )
    117 		while ( fgets(buf, sizeof(buf), fp_in) != NULL )
    118 		    if ( buf[0] == '#' || buf[0] == '%' )
    119 			continue;
    120 		    else if ( buf[0] != '@' )
    121 			fprintf(fp_out, "%s", buf);
    122 		    else break;
    123 	fclose(fp_in);
    124     }	/* End if */
    125 
    126 }   /* End of dumprequest */
    127 
    128 /*****************************************************************************/