reactos/tools/cat.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS conCATenation tool
   4  * FILE:            tools/cat.c
   5  * PURPOSE:         Concatenates STDIN or an arbitrary number of files to STDOUT
   6  * PROGRAMMERS:     David Welch
   7  *                  Semyon Novikov (tappak)
   8  *                  Hermès Bélusca - Maïto
   9  */
  10
  11 #include <stdio.h>
  12
  13 #ifdef _WIN32
  14 #include <fcntl.h>
  15 #else
  16 #define O_TEXT   0x4000
  17 #define O_BINARY 0x8000
  18 #define setmode(fd, mode) // This function is useless in *nix world.
  19 #define stricmp strcasecmp
  20 #endif
  21
  22 #define ARRAYSIZE(a) (sizeof(a) / sizeof((a)[0]))
  23
  24 void help(void)
  25 {
  26     fprintf(stdout,
  27             "\n"
  28             "ReactOS File Concatenation Tool\n"
  29             "\n"
  30             "Usage: cat [options] [file [...]]\n"
  31             "options - Currently ignored\n");
  32 }
  33
  34 int main(int argc, char* argv[])
  35 {
  36     int i;
  37     FILE* in;
  38     unsigned char buff[512];
  39     size_t cnt, readcnt;
  40
  41     if (argc >= 2)
  42     {
  43         if (stricmp(argv[1], "-h"    ) == 0 ||
  44             stricmp(argv[1], "--help") == 0 ||
  45             stricmp(argv[1], "/?"    ) == 0 ||
  46             stricmp(argv[1], "/help" ) == 0)
  47         {
  48             help();
  49             return 0;
  50         }
  51     }
  52
  53     /* Set STDOUT to binary */
  54     setmode(fileno(stdout), O_BINARY);
  55
  56     /* Special case where we run 'cat' without any argument: we use STDIN */
  57     if (argc <= 1)
  58     {
  59         unsigned int ch;
  60
  61         /* Set STDIN to binary */
  62         setmode(fileno(stdin), O_BINARY);
  63
  64 #if 0 // Version using feof()
  65         ch = fgetc(stdin);
  66         while (!feof(stdin))
  67         {
  68             putchar(ch);
  69             ch = fgetc(stdin);
  70         }
  71 #else
  72         while ((ch = fgetc(stdin)) != EOF)
  73         {
  74             putchar(ch);
  75         }
  76 #endif
  77
  78         return 0;
  79     }
  80
  81     /* We have files: read them and output them to STDOUT */
  82     for (i = 1; i < argc; i++)
  83     {
  84         /* Open the file in binary read mode */
  85         in = fopen(argv[i], "rb");
  86         if (in == NULL)
  87         {
  88             fprintf(stderr, "Failed to open file '%s'\n", argv[i]);
  89             return -1;
  90         }
  91
  92         /* Dump the file to STDOUT */
  93         cnt = 0; readcnt = 0;
  94         while (readcnt == cnt)
  95         {
  96             /* Read data from the input file */
  97             cnt = ARRAYSIZE(buff);
  98             readcnt = fread(&buff, sizeof(buff[0]), cnt, in);
  99             if (readcnt != cnt)
 100             {
 101                 /*
 102                  * The real number of read bytes differs from the number of bytes
 103                  * we wanted to read, so either a reading error occurred, or EOF
 104                  * was reached while reading. Bail out if it is a reading error.
 105                  */
 106                 if (!feof(in))
 107                 {
 108                     fprintf(stderr, "Error while reading file '%s'\n", argv[i]);
 109                     fclose(in);
 110                     return -1;
 111                 }
 112             }
 113
 114             /* Nothing to be read anymore, so we can gracefully break */
 115             if (readcnt == 0) break;
 116
 117             /* Write data to STDOUT */
 118             fwrite(&buff, sizeof(buff[0]), readcnt, stdout);
 119         }
 120
 121         /* Finally close the file */
 122         fclose(in);
 123     }
 124
 125     return 0;
 126 }
 127
 128 /* EOF */