From aad798d9df7417009fa4438aac61ac8e0e4ded36 Mon Sep 17 00:00:00 2001 From: radiohotline Date: Sat, 14 Mar 2026 16:20:47 +0300 Subject: first commit --- src/cat.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ src/cp.c | 28 ++++++++++++++++++++++++++++ src/echo.c | 11 +++++++++++ src/head.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ src/tac.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/tail.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/touch.c | 28 ++++++++++++++++++++++++++++ 7 files changed, 278 insertions(+) create mode 100644 src/cat.c create mode 100644 src/cp.c create mode 100644 src/echo.c create mode 100644 src/head.c create mode 100644 src/tac.c create mode 100644 src/tail.c create mode 100644 src/touch.c (limited to 'src') diff --git a/src/cat.c b/src/cat.c new file mode 100644 index 0000000..b89cba6 --- /dev/null +++ b/src/cat.c @@ -0,0 +1,45 @@ +#include +#include +#include + +#define PROGRAM_NAME "cat" + +struct stat statbuf; + +int main(int argc, char* argv[]) { + FILE *fileptr = NULL; + char buf[8192]; + char ch; + + if (argc < 2) { + while (fgets(buf, sizeof(buf), stdin) != NULL) { + printf("%s", buf); + } + + return 0; + } + + if (access(argv[1], F_OK) != 0) { + printf("%s: %s: No such file or directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + if (stat(argv[1], &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) { + printf("%s: %s is a directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + fileptr = fopen(argv[1], "r"); + + if (fileptr == NULL){ + perror("cat"); + return 1; + } + + while ((ch = fgetc(fileptr)) != EOF) { + putchar(ch); + } + + fclose(fileptr); + return 0; +} diff --git a/src/cp.c b/src/cp.c new file mode 100644 index 0000000..573677d --- /dev/null +++ b/src/cp.c @@ -0,0 +1,28 @@ +#include + +int main(int argc, char* argv[]) { + FILE *input, *output; + char ch; + + if (argv[2] == NULL) { + printf("specify a destination\n"); + return 1; + } + + input = fopen(argv[1], "r"); + output = fopen(argv[2], "a"); + + if (input == NULL || output == NULL) { + printf("failed to open the file dingus\n"); + return 1; + } else { + while ((ch = fgetc(input)) != EOF) { + fputc(ch, output); + } + } + + fclose(input); + fclose(output); + + return 0; +} diff --git a/src/echo.c b/src/echo.c new file mode 100644 index 0000000..ad853f1 --- /dev/null +++ b/src/echo.c @@ -0,0 +1,11 @@ +#include + +int main(int argc, char *argv[]) { + for (int i=1; i < argc; i++) { + printf("%s ", argv[i]); + } + + printf("\n"); + + return 0; +} diff --git a/src/head.c b/src/head.c new file mode 100644 index 0000000..d669545 --- /dev/null +++ b/src/head.c @@ -0,0 +1,49 @@ +#include +#include +#include + +#define PROGRAM_NAME "head" + +struct stat statbuf; + +int main(int argc, char* argv[]) { + FILE *fileptr = NULL; + char buf[8192]; + char ch; + int lines = 0; + + if (argc < 2) { + while (fgets(buf, sizeof(buf), stdin) != NULL) { + printf("%s", buf); + } + + return 0; + } + + if (access(argv[1], F_OK) != 0) { + printf("%s: %s: No such file or directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + if (stat(argv[1], &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) { + printf("%s: %s is a directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + fileptr = fopen(argv[1], "r"); + + if (fileptr == NULL) { + perror("head"); + return 1; + } + + while (((ch = fgetc(fileptr)) != EOF) && (lines < 10)) { + if (ch == '\n') { + lines++; + } + putchar(ch); + } + + fclose(fileptr); + return 0; +} diff --git a/src/tac.c b/src/tac.c new file mode 100644 index 0000000..3f7caf6 --- /dev/null +++ b/src/tac.c @@ -0,0 +1,58 @@ +#include +#include +#include + +#define PROGRAM_NAME "tac" + +struct stat statbuf; + +int main(int argc, char* argv[]) { + FILE *fileptr = NULL; + char buf[8192]; + char ch; + int size = 0; + + if (argc < 2) { + while (fgets(buf, sizeof(buf), stdin) != NULL) { + printf("%s", buf); + } + + return 0; + } + + if (access(argv[1], F_OK) != 0) { + printf("%s: %s: No such file or directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + if (stat(argv[1], &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) { + printf("%s: %s is a directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + fileptr = fopen(argv[1], "r"); + + if (fileptr == NULL) { + perror("tac"); + return 1; + } + + while ((ch = fgetc(fileptr)) != EOF) { + size++; + } + + size = size - 2; + rewind(fileptr); + + while (size >= 0) { + fseek(fileptr, size, 0); + ch = fgetc(fileptr); + putchar(ch); + size--; + } + + printf("\n"); + + fclose(fileptr); + return 0; +} diff --git a/src/tail.c b/src/tail.c new file mode 100644 index 0000000..e34b90f --- /dev/null +++ b/src/tail.c @@ -0,0 +1,59 @@ +#include +#include +#include + +#define PROGRAM_NAME "tail" + +struct stat statbuf; + +int main(int argc, char* argv[]) { + FILE *fileptr = NULL; + char buf[8192]; + char ch; + int size = 0, lines = 0; + + if (argc < 2) { + while (fgets(buf, sizeof(buf), stdin) != NULL) { + printf("%s", buf); + } + + return 0; + } + + if (access(argv[1], F_OK) != 0) { + printf("%s: %s: No such file or directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + if (stat(argv[1], &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) { + printf("%s: %s is a directory.\n", PROGRAM_NAME, argv[1]); + return 1; + } + + fileptr = fopen(argv[1], "r"); + + if (fileptr == NULL) { + printf("ermmmm can't open this\n"); + return 1; + } + + while ((ch = fgetc(fileptr)) != EOF) { + size++; + } + + size = size - 2; + rewind(fileptr); + + while (size >= 0 && lines < 10) { + fseek(fileptr, size, 0); + ch = fgetc(fileptr); + if (ch == '\n') { + lines++; + } + putchar(ch); + size--; + } + + fclose(fileptr); + return 0; +} diff --git a/src/touch.c b/src/touch.c new file mode 100644 index 0000000..6cbde27 --- /dev/null +++ b/src/touch.c @@ -0,0 +1,28 @@ +#include +#include +#include +#include + +#define PROGRAM_NAME "touch" + +int main(int argc, char* argv[]) { + if (argc < 2) { + fprintf(stderr, "%s: missing file operand\n", PROGRAM_NAME); + return 1; + } + + for (int i = 1; i < argc; i++) { + if (utimes(argv[i], NULL) != 0) { + int file = open(argv[i], O_CREAT | O_WRONLY, 0644); + + if (file == -1) { + perror("touch"); + continue; + } + + close(file); + } + } + + return 0; +} -- cgit v1.3