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https://github.com/samsonjs/csc360-a1-shell.git
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Sami Samhuri
4f4e97475b
Replace Ruby's old wordexp-like command splitting with a tokenizer and
parser that understands ; and && while honoring quotes and nesting.
Implement richer expansions for command substitution, arithmetic,
parameter defaults (${var:-...}), brace expansion, and escaped
dollar/backtick behavior via shared quote-state handling.
Expand the test suite with parser/expansion edge cases, escaping
parity checks, builtin usage validation, and job-control refresh tests.
Keep C green by adding a compat test profile for c/Makefile test and
by returning nonzero on builtin failures in -c mode, including clearer
`bg` usage output.
107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
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* A simple shell with some basic features.
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*
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* Sami Samhuri 0327342
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* January 31, 2006
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* CSC 360, Assignment 1
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*
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* builtins.c
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* $Id: builtins.c 184 2006-01-29 08:53:30Z sjs $
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*/
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/*#define _GNU_SOURCE*/
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "builtins.h"
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#include "exec.h"
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#include "jobs.h"
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#include "utils.h"
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int builtin_bg(int argc, char **argv) {
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if (argc < 2) {
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fprintf(stderr, "Usage: bg <command>\n");
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fprintf(stderr, "Runs <command> in the background\n");
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return -1;
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}
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pid_t pid = exec_command(&argv[1], 1); /* &argv[1] skips 'bg' */
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if (pid > 0) {
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job j = add_job(pid, &argv[1]);
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printf("Running job " YELLOW "%i" WHITE " (pid %i) in background\n" CLEAR, j->id, pid);
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}
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return pid;
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}
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int builtin_bgkill(int argc, char **argv) {
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if (argc != 2) {
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fprintf(stderr, "bgkill: usage 'bgkill <job number>'\n");
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fprintf(stderr, " type 'bglist' to see running jobs=n");
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return -1;
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}
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int job_id = atoi(argv[1]);
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job j = job_with_id(job_id);
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if (!j) {
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fprintf(stderr, YELLOW "Invalid job number\n");
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fprintf(stderr, "(type 'bglist' to see running jobs)\n");
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return -1;
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}
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kill(j->pid, SIGTERM);
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return 1;
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}
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int builtin_bglist(void) {
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int num_jobs;
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if (!(num_jobs = get_num_jobs()))
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return 0;
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job j;
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for (j = get_job_list(); j; j = j->next) {
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printf(YELLOW "%i" WHITE ": (pid %i)" YELLOW " %s\n" CLEAR, j->id, j->pid, j->cmdline);
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}
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printf(GREEN "Total: %i background job(s) running\n" CLEAR, num_jobs);
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return num_jobs;
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}
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int builtin_cd(int argc, char **argv) {
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static char *lastdir = NULL;
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char *dir, *pwd = getcwd(NULL, 0);
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if (!lastdir) /* initialize */
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lastdir = pwd;
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if (argc < 2) /* cd w/ no args acts like cd $HOME */
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dir = getenv("HOME");
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else {
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if (!strncmp(argv[1], "-", 1))
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dir = lastdir; /* cd - changes to previous dir */
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else
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dir = argv[1];
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}
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if (chdir(dir) < 0) { /* error */
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fprintf(stderr, RED "cd: %s: %s" CLEAR, strerror(errno), dir);
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return -1;
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}
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/* save the last dir for cd -, if it's different */
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if (strcmp(pwd, dir))
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lastdir = pwd;
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return 1;
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}
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void builtin_clear(void) { printf("\033[2J"); }
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void builtin_pwd(void) {
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char *pwd = getcwd(NULL, 0);
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printf("%s\n", pwd);
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xfree(pwd);
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}
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