mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-07 14:32:23 +00:00
9080d11a6c
Currently if an fopen fails the error exit path is via code that checks if fp is not null and closes the file, however, fp is null so this check and close is redundant. Since the only use of the err exit label is on the fopen check, remove it and replace the code with a simple return of errno. Also remove variable rc since it's no longer required. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Signed-off-by: Fan Wu <wufan@kernel.org>
138 lines
2.2 KiB
C
138 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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static void usage(const char *const name)
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{
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printf("Usage: %s OutputFile (PolicyFile)\n", name);
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exit(EINVAL);
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}
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static int policy_to_buffer(const char *pathname, char **buffer, size_t *size)
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{
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size_t fsize;
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size_t read;
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char *lbuf;
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int rc = 0;
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FILE *fd;
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fd = fopen(pathname, "r");
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if (!fd) {
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rc = errno;
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goto out;
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}
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fseek(fd, 0, SEEK_END);
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fsize = ftell(fd);
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rewind(fd);
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lbuf = malloc(fsize);
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if (!lbuf) {
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rc = ENOMEM;
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goto out_close;
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}
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read = fread((void *)lbuf, sizeof(*lbuf), fsize, fd);
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if (read != fsize) {
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rc = -1;
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goto out_free;
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}
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*buffer = lbuf;
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*size = fsize;
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fclose(fd);
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return rc;
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out_free:
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free(lbuf);
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out_close:
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fclose(fd);
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out:
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return rc;
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}
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static int write_boot_policy(const char *pathname, const char *buf, size_t size)
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{
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FILE *fd;
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size_t i;
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fd = fopen(pathname, "w");
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if (!fd)
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return errno;
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fprintf(fd, "/* This file is automatically generated.");
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fprintf(fd, " Do not edit. */\n");
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fprintf(fd, "#include <linux/stddef.h>\n");
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fprintf(fd, "\nextern const char *const ipe_boot_policy;\n\n");
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fprintf(fd, "const char *const ipe_boot_policy =\n");
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if (!buf || size == 0) {
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fprintf(fd, "\tNULL;\n");
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fclose(fd);
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return 0;
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}
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fprintf(fd, "\t\"");
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for (i = 0; i < size; ++i) {
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switch (buf[i]) {
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case '"':
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fprintf(fd, "\\\"");
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break;
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case '\'':
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fprintf(fd, "'");
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break;
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case '\n':
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fprintf(fd, "\\n\"\n\t\"");
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break;
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case '\\':
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fprintf(fd, "\\\\");
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break;
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case '\t':
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fprintf(fd, "\\t");
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break;
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case '\?':
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fprintf(fd, "\\?");
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break;
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default:
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fprintf(fd, "%c", buf[i]);
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}
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}
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fprintf(fd, "\";\n");
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fclose(fd);
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return 0;
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}
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int main(int argc, const char *const argv[])
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{
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char *policy = NULL;
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size_t len = 0;
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int rc = 0;
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if (argc < 2)
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usage(argv[0]);
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if (argc > 2) {
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rc = policy_to_buffer(argv[2], &policy, &len);
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if (rc != 0)
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goto cleanup;
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}
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rc = write_boot_policy(argv[1], policy, len);
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cleanup:
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if (policy)
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free(policy);
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if (rc != 0)
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perror("An error occurred during policy conversion: ");
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return rc;
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}
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