source: mainline/uspace/app/bdsh/cmds/builtins/batch/batch.c@ 2b3dd78

/*
 * Copyright (c) 2011 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stddef.h>
#include <errno.h>
#include <str.h>
#include "config.h"
#include "util.h"
#include "errors.h"
#include "entry.h"
#include "batch.h"
#include "cmds.h"
#include "input.h"

static const char *cmdname = "batch";

/* Dispays help for batch in various levels */
void help_cmd_batch(unsigned int level)
{
        if (level == HELP_SHORT) {
                printf(
                "\n  batch [filename] [-c]\n"
                "  Issues commands stored in the file.\n"
                "  Each command must correspond to the single line in the file.\n\n");
        } else {
                printf(
                "\n  `batch' - issues a batch of commands\n"
                "  Issues commands stored in the file. Each command must correspond\n"
                "  to the single line in the file. Empty lines can be used to visually\n"
                "  separate groups of commands. There is no support for comments,\n"
                "  variables, recursion or other programming constructs - the `batch'\n"
                "  command is indeed very trivial.\n"
                "  If the filename is followed by -c, execution continues even if some\n"
                "  of the commands failed.\n\n");
        }

        return;
}

/* Main entry point for batch, accepts an array of arguments and a
 * pointer to the cliuser_t structure */
int cmd_batch(char **argv, cliuser_t *usr)
{
        unsigned int argc;
        bool continue_despite_errors = false;

        /* Count the arguments */
        for (argc = 0; argv[argc] != NULL; argc ++);

        if (argc < 2) {
                printf("%s - no input file provided.\n", cmdname);
                return CMD_FAILURE;
        }

        if (argc > 2) {
                if (str_cmp(argv[2], "-c") == 0)
                        continue_despite_errors = true;
        }

        errno_t rc = EOK;
        FILE *batch = fopen(argv[1], "r");
        if (batch == NULL) {
                printf("%s - Cannot open file %s\n", cmdname, argv[1]);
                return CMD_FAILURE;
        } else {
                cliuser_t fusr;
                fusr.name = usr->name;
                fusr.cwd = usr->cwd;
                fusr.prompt = usr->prompt;
                fusr.line = malloc(INPUT_MAX + 1);
                char *cur = fusr.line;
                char *end = fusr.line + INPUT_MAX;
                int c = fgetc(batch);
                while (fusr.line != NULL) {
                        if (c == '\n' || c == EOF || cur == end) {
                                *cur = '\0';
                                if (cur == fusr.line) {
                                        /* skip empty line */
                                        rc = EOK;
                                        free(cur);
                                } else {
                                        printf(">%s\n", fusr.line);
                                        rc = process_input(&fusr);
                                        /* fusr->line was freed by process_input() */
                                        if ((rc != EOK) && continue_despite_errors) {
                                                /* Mute the error. */
                                                rc = EOK;
                                        }
                                }
                                if (rc == 0 && c != EOF) {
                                        fusr.line = malloc(INPUT_MAX + 1);
                                        cur = fusr.line;
                                        end = fusr.line + INPUT_MAX;
                                } else {
                                        break;
                                }
                        } else {
                                *cur++ = c;
                        }
                        c = fgetc(batch);
                }
                fclose(batch);
        }

        return CMD_SUCCESS;
}