Enrico Fraccaroli
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/// MentOS, The Mentoring Operating system project
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/// @file cat.c
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/// @brief `cat` program.
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include <strerror.h>
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int main(int argc, char **argv)
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{
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if (argc != 2) {
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printf("%s: missing operand.\n", argv[0]);
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printf("Try '%s --help' for more information.\n\n", argv[0]);
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return 1;
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}
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if (strcmp(argv[1], "--help") == 0) {
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printf("Prints the content of the given file.\n");
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printf("Usage:\n");
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printf(" %s <file>\n\n", argv[0]);
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return 0;
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}
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int fd = open(argv[1], O_RDONLY, 42);
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if (fd < 0) {
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printf("%s: %s: %s\n\n", argv[0], strerror(errno), argv[1]);
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return 1;
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}
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char buffer[BUFSIZ];
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// Put on the standard output the characters.
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while (read(fd, buffer, BUFSIZ) > 0) {
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puts(buffer);
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}
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putchar('\n');
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putchar('\n');
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close(fd);
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return 0;
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}
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