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//
// builtins.c
//
// Built-in shell commands
//
// Copyright (C) 2012 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include "sh.h"
builtin(break) {
struct job *j;
int levels = 1;
if (job->args.num > 1) {
levels = atoi(job->args.first->next->value);
if (levels < 1) levels = 1;
}
for (j = job; j; j = j->parent) {
j->flags |= J_BREAK;
if (j->flags & J_LOOP) {
if (--levels == 0) break;
}
}
return job->shell->lastrc;
}
builtin(chdir) {
char *path;
if (job->args.num > 1) {
path = job->args.first->next->value;
} else {
path = "/";
}
if (chdir(path) < 0) {
fprintf(stderr, "%s: %s\n", path, strerror(errno));
return 1;
}
return 0;
}
builtin(continue) {
struct job *j;
int levels = 1;
if (job->args.num > 1) {
levels = atoi(job->args.first->next->value);
if (levels < 1) levels = 1;
}
for (j = job; j; j = j->parent) {
if (j->flags & J_LOOP) {
if (--levels == 0) {
j->flags |= J_CONTINUE;
break;
}
}
j->flags |= J_BREAK;
}
return job->shell->lastrc;
}
builtin(debug) {
job->shell->debug = 1;
return 0;
}
builtin(exit) {
int rc = 0;
if (job->args.num > 1) rc = atoi(job->args.first->next->value);
job->shell->done = 1;
return rc;
}
builtin(false) {
return 1;
}
builtin(return) {
struct job *j;
int rc = 0;
if (job->args.num > 1) rc = atoi(job->args.first->next->value);
for (j = job; j; j = j->parent) {
j->flags |= J_BREAK;
if (j->flags & J_FUNCTION) break;
}
return rc;
}
builtin(set) {
struct var *var;
struct arg *arg;
if (job->args.num > 1) {
// Set shell arguments
struct job *scope = get_arg_scope(job);
struct args *args = &scope->args;
char *argv0 = strdup(args->first->value);
args->first->value = NULL;
delete_args(args);
add_arg(args, argv0);
free(argv0);
arg = job->args.first->next;
while (arg) {
add_arg(args, arg->value);
arg = arg->next;
}
} else {
// Print variables
struct job *scope = get_var_scope(job, 1);
var = scope->vars;
while (var) {
printf("%s=%s\n", var->name, var->value);
var = var->next;
}
}
return 0;
}
builtin(shift) {
int n = 1;
struct job *scope = get_arg_scope(job);
struct arg *arg = scope->args.first;
if (job->args.num > 1) n = atoi(job->args.first->next->value);
if (n < 0) return 1;
if (!arg) return 0;
while (n > 0 && arg->next) {
struct arg *a = arg->next;
arg->next = a->next;
free(a->value);
free(a);
scope->args.num--;
n--;
}
return 0;
}
builtin(true) {
return 0;
}