tests/test-text.cxx

   1 // do some non-destructive read tests relating text files
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 static void readchars( FILE *fd ) {
   7     int c;
   8     while ( (c = fgetc(fd)) != EOF ) {
   9         printf("c = %d", c);
  10         if ( c == 10 ) {
  11             printf(" LF \\n");
  12         }
  13         if ( c == 13 ) {
  14             printf(" CR \\r");
  15         }
  16         printf("\n");
  17     }
  18 }
  19
  20
  21 static void readlines( FILE *fd ) {
  22     char line[256];
  23     while ( fgets(line, 255, fd) != NULL ) {
  24         int len = strlen(line);
  25         printf("line = %s", line);
  26         if ( len >= 2 ) {
  27             printf("  char[n - 1] = %d  char[n] = %d\n",
  28                    line[len-2], line[len-1]);
  29         } else if ( len >= 1 ) {
  30             printf("  char[n] = %d\n",line[len-1]);
  31         } else {
  32             printf("empty string\n");
  33         }
  34     }
  35 }
  36
  37
  38 int main( int argc, char **argv ) {
  39     // check usage
  40     if ( argc != 2 ) {
  41         printf("usage: %s file\n", argv[0]);
  42         return -1;
  43     }
  44
  45     char file[256];
  46     strcpy( file, argv[1] );
  47     FILE *fd;
  48
  49     // open a file in (default) text mode
  50     printf("TEXT MODE (DEFAULT) by character\n\n");
  51     fd = fopen( file, "r" );
  52     if ( fd != NULL ) {
  53         readchars( fd );
  54         fclose(fd);
  55     } else {
  56         printf("Cannot open %s\n", file);
  57     }
  58     printf("\n");
  59
  60     // open a file in (explicit) text mode
  61     printf("TEXT MODE (EXPLICIT) by character\n\n");
  62     fd = fopen( file, "rt" );
  63     if ( fd != NULL ) {
  64         readchars( fd );
  65         fclose(fd);
  66     } else {
  67         printf("Cannot open %s\n", file);
  68     }
  69     printf("\n");
  70
  71     // open a file in (explicit) binary mode
  72     printf("BINARY MODE (EXPLICIT) by character\n\n");
  73     fd = fopen( file, "rb" );
  74     if ( fd != NULL ) {
  75         readchars( fd );
  76         fclose(fd);
  77     } else {
  78         printf("Cannot open %s\n", file);
  79     }
  80     printf("\n");
  81
  82     // open a file in (default) text mode
  83     printf("TEXT MODE (DEFAULT) by line\n\n");
  84     fd = fopen( file, "r" );
  85     if ( fd != NULL ) {
  86         readlines( fd );
  87         fclose(fd);
  88     } else {
  89         printf("Cannot open %s\n", file);
  90     }
  91     printf("\n");
  92
  93     // open a file in (explicit) text mode
  94     printf("TEXT MODE (EXPLICIT) by line\n\n");
  95     fd = fopen( file, "rt" );
  96     if ( fd != NULL ) {
  97         readlines( fd );
  98         fclose(fd);
  99     } else {
 100         printf("Cannot open %s\n", file);
 101     }
 102     printf("\n");
 103
 104     // open a file in (explicit) binary mode
 105     printf("BINARY MODE (EXPLICIT) by line\n\n");
 106     fd = fopen( file, "rb" );
 107     if ( fd != NULL ) {
 108         readlines( fd );
 109         fclose(fd);
 110     } else {
 111         printf("Cannot open %s\n", file);
 112     }
 113     printf("\n");
 114
 115     return 0;
 116 }