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