2.11BSD#431 - /usr/src/local/cxref/docxref.c

   1: /*
   2: ** docxref.c
   3: **
   4: ** Driver for lex based scanner.  Arranges for stdin to be each named
   5: ** file in turn, so that yylex() never has to know about files.
   6: ** Some of this code is not pretty, but it's not too bad.
   7: **
   8: ** Arnold Robbins, Information and Computer Science, Georgia Tech
   9: **	gatech!arnold
  10: ** Copyright (c) 1984 by Arnold Robbins.
  11: ** All rights reserved.
  12: ** This program may not be sold, but may be distributed
  13: ** provided this header is included.
  14: */
  15: 
  16: #include <stdio.h>
  17: #include <ctype.h>
  18: 
  19: #define TRUE    1
  20: #define FALSE   0
  21: 
  22: extern char yytext[];
  23: extern int yyleng;
  24: 
  25: int line_no = 1;    /* current line number */
  26: char *fname = NULL; /* current file name */
  27: 
  28: char *basename();   /* strips leading path of a file name */
  29: 
  30: main(argc,argv)
  31: int argc;
  32: char **argv;
  33: {
  34:     FILE saved_in, *fp;
  35:     char *name;
  36:     int more_input = FALSE;     /* more files to process */
  37:     int read_stdin = FALSE;
  38: 
  39:     name = basename(argv[0]);   /* save command name */
  40:     fname = "stdin";        /* assume stdin */
  41: 
  42:     if(argc == 1)
  43:     {
  44:         yylex();
  45:         exit(0);
  46:     }
  47: 
  48:     if(argv[1][0] == '-' && argv[1][1] != '\0')
  49:             usage(argv[0]); /* will exit */
  50: 
  51:     saved_in = *stdin;
  52:     /* save stdin in case "-" is found in middle of command line */
  53: 
  54:     for(--argc, argv++; argc > 0; --argc, argv++)
  55:     {
  56:         if(fileno(stdin) != fileno((&saved_in)) || read_stdin)
  57:             fclose(stdin);
  58:         /* free unix file descriptors */
  59: 
  60:         if(strcmp(*argv, "-") == 0)
  61:         {
  62:             *stdin = saved_in;
  63:             fname = "stdin";
  64:             read_stdin = TRUE;
  65:             more_input = (argc - 1 > 0);
  66:         }
  67:         else if((fp = fopen(*argv,"r")) == NULL)
  68:         {
  69:             fprintf(stderr,"%s: can't open %s\n", name, *argv);
  70:             continue;
  71:         }
  72:         else
  73:         {
  74:             *stdin = *fp;
  75:             /* do it this way so that yylex() */
  76:             /* never knows about files etc. */
  77:             more_input = (argc - 1 > 0);
  78:             fname = *argv;
  79:         }
  80: 
  81:         yylex();    /* do the work */
  82: 
  83:         if(more_input)
  84:             line_no = 1;
  85:     }
  86: }
  87: 
  88: outid()
  89: {
  90:     char *basename();
  91: 
  92:     printf("%s\t%s\t%d\n", yytext, basename(fname), line_no);
  93: }
  94: 
  95: usage(name)
  96: char *name;
  97: {
  98:     fprintf(stderr,"usage: %s [files]\n", name);
  99:     exit(1);
 100: }
 101: 
 102: #include "basename.c"

Defined functions

Defined variables

Defined macros