training

Code I wrote during training
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ex-4.7.c (1132B)

      1 /*
      2  * Advanced Programming in the UNIX(r) Environment
      3  *
      4  * Exercise 4.7
      5 */
      6 
      7 #include <stdio.h>
      8 #include <stdlib.h>
      9 #include <unistd.h>
     10 #include <fcntl.h>
     11 #include <sys/stat.h>
     12 
     13 #define BUFSIZE 8192
     14 
     15 int
     16 main(int argc, char *argv[])
     17 {
     18    int fd, fd2;
     19    ssize_t size;
     20    char buf[BUFSIZE] = { 0 };
     21 
     22    /* Arguments check */
     23    if( argc != 3 ) {
     24       printf("Usage: %s <source file> <destination file>\n", argv[0]);
     25       return EXIT_FAILURE;
     26    }
     27 
     28    /* open the source file */
     29    if( (fd = open(argv[1], O_RDONLY)) == -1 ) {
     30       perror("open(source)");
     31       return EXIT_FAILURE;
     32    }
     33 
     34    /* open the destination file */
     35    if( (fd2 = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR)) == -1 ) {
     36       perror("open(destination)");
     37 
     38       close(fd); /* close the source file */
     39       return EXIT_FAILURE;
     40    }
     41 
     42    /* copy the file */
     43    while( (size = read(fd, buf, 1)) > 0 ) {
     44       if( *buf && write(fd2, buf, size) != size ) {
     45          perror("write");
     46 	 break;
     47       }
     48    }
     49 
     50    /* read error */
     51    if( size == -1 )
     52       perror("read");
     53 
     54    close(fd);
     55    close(fd2);
     56 
     57    return EXIT_SUCCESS;
     58 } /* eof main() */
     59