mirror of https://gitee.com/openkylin/linux.git
468 lines
8.5 KiB
C
468 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2011 The Chromium Authors, All Rights Reserved.
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* Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
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*
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* util_is_printable_string contributed by
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* Pantelis Antoniou <pantelis.antoniou AT gmail.com>
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "libfdt.h"
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#include "util.h"
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#include "version_gen.h"
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char *xstrdup(const char *s)
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{
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int len = strlen(s) + 1;
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char *d = xmalloc(len);
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memcpy(d, s, len);
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return d;
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}
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int xavsprintf_append(char **strp, const char *fmt, va_list ap)
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{
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int n, size = 0; /* start with 128 bytes */
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char *p;
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va_list ap_copy;
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p = *strp;
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if (p)
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size = strlen(p);
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va_copy(ap_copy, ap);
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n = vsnprintf(NULL, 0, fmt, ap_copy) + 1;
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va_end(ap_copy);
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p = xrealloc(p, size + n);
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n = vsnprintf(p + size, n, fmt, ap);
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*strp = p;
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return strlen(p);
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}
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int xasprintf_append(char **strp, const char *fmt, ...)
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{
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int n;
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va_list ap;
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va_start(ap, fmt);
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n = xavsprintf_append(strp, fmt, ap);
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va_end(ap);
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return n;
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}
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int xasprintf(char **strp, const char *fmt, ...)
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{
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int n;
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va_list ap;
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*strp = NULL;
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va_start(ap, fmt);
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n = xavsprintf_append(strp, fmt, ap);
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va_end(ap);
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return n;
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}
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char *join_path(const char *path, const char *name)
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{
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int lenp = strlen(path);
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int lenn = strlen(name);
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int len;
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int needslash = 1;
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char *str;
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len = lenp + lenn + 2;
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if ((lenp > 0) && (path[lenp-1] == '/')) {
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needslash = 0;
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len--;
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}
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str = xmalloc(len);
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memcpy(str, path, lenp);
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if (needslash) {
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str[lenp] = '/';
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lenp++;
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}
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memcpy(str+lenp, name, lenn+1);
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return str;
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}
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bool util_is_printable_string(const void *data, int len)
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{
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const char *s = data;
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const char *ss, *se;
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/* zero length is not */
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if (len == 0)
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return 0;
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/* must terminate with zero */
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if (s[len - 1] != '\0')
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return 0;
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se = s + len;
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while (s < se) {
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ss = s;
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while (s < se && *s && isprint((unsigned char)*s))
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s++;
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/* not zero, or not done yet */
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if (*s != '\0' || s == ss)
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return 0;
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s++;
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}
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return 1;
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}
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/*
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* Parse a octal encoded character starting at index i in string s. The
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* resulting character will be returned and the index i will be updated to
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* point at the character directly after the end of the encoding, this may be
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* the '\0' terminator of the string.
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*/
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static char get_oct_char(const char *s, int *i)
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{
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char x[4];
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char *endx;
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long val;
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x[3] = '\0';
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strncpy(x, s + *i, 3);
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val = strtol(x, &endx, 8);
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assert(endx > x);
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(*i) += endx - x;
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return val;
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}
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/*
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* Parse a hexadecimal encoded character starting at index i in string s. The
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* resulting character will be returned and the index i will be updated to
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* point at the character directly after the end of the encoding, this may be
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* the '\0' terminator of the string.
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*/
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static char get_hex_char(const char *s, int *i)
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{
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char x[3];
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char *endx;
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long val;
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x[2] = '\0';
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strncpy(x, s + *i, 2);
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val = strtol(x, &endx, 16);
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if (!(endx > x))
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die("\\x used with no following hex digits\n");
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(*i) += endx - x;
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return val;
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}
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char get_escape_char(const char *s, int *i)
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{
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char c = s[*i];
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int j = *i + 1;
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char val;
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switch (c) {
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case 'a':
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val = '\a';
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break;
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case 'b':
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val = '\b';
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break;
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case 't':
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val = '\t';
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break;
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case 'n':
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val = '\n';
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break;
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case 'v':
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val = '\v';
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break;
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case 'f':
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val = '\f';
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break;
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case 'r':
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val = '\r';
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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j--; /* need to re-read the first digit as
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* part of the octal value */
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val = get_oct_char(s, &j);
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break;
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case 'x':
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val = get_hex_char(s, &j);
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break;
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default:
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val = c;
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}
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(*i) = j;
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return val;
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}
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int utilfdt_read_err(const char *filename, char **buffp, size_t *len)
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{
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int fd = 0; /* assume stdin */
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char *buf = NULL;
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size_t bufsize = 1024, offset = 0;
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int ret = 0;
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*buffp = NULL;
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if (strcmp(filename, "-") != 0) {
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return errno;
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}
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/* Loop until we have read everything */
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buf = xmalloc(bufsize);
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do {
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/* Expand the buffer to hold the next chunk */
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if (offset == bufsize) {
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bufsize *= 2;
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buf = xrealloc(buf, bufsize);
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}
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ret = read(fd, &buf[offset], bufsize - offset);
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if (ret < 0) {
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ret = errno;
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break;
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}
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offset += ret;
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} while (ret != 0);
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/* Clean up, including closing stdin; return errno on error */
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close(fd);
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if (ret)
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free(buf);
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else
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*buffp = buf;
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if (len)
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*len = bufsize;
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return ret;
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}
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char *utilfdt_read(const char *filename, size_t *len)
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{
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char *buff;
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int ret = utilfdt_read_err(filename, &buff, len);
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if (ret) {
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fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
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strerror(ret));
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return NULL;
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}
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/* Successful read */
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return buff;
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}
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int utilfdt_write_err(const char *filename, const void *blob)
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{
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int fd = 1; /* assume stdout */
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int totalsize;
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int offset;
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int ret = 0;
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const char *ptr = blob;
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if (strcmp(filename, "-") != 0) {
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (fd < 0)
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return errno;
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}
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totalsize = fdt_totalsize(blob);
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offset = 0;
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while (offset < totalsize) {
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ret = write(fd, ptr + offset, totalsize - offset);
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if (ret < 0) {
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ret = -errno;
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break;
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}
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offset += ret;
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}
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/* Close the file/stdin; return errno on error */
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if (fd != 1)
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close(fd);
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return ret < 0 ? -ret : 0;
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}
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int utilfdt_write(const char *filename, const void *blob)
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{
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int ret = utilfdt_write_err(filename, blob);
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if (ret) {
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fprintf(stderr, "Couldn't write blob to '%s': %s\n", filename,
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strerror(ret));
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}
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return ret ? -1 : 0;
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}
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int utilfdt_decode_type(const char *fmt, int *type, int *size)
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{
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int qualifier = 0;
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if (!*fmt)
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return -1;
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/* get the conversion qualifier */
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*size = -1;
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if (strchr("hlLb", *fmt)) {
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qualifier = *fmt++;
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if (qualifier == *fmt) {
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switch (*fmt++) {
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/* TODO: case 'l': qualifier = 'L'; break;*/
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case 'h':
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qualifier = 'b';
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break;
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}
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}
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}
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/* we should now have a type */
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if ((*fmt == '\0') || !strchr("iuxs", *fmt))
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return -1;
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/* convert qualifier (bhL) to byte size */
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if (*fmt != 's')
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*size = qualifier == 'b' ? 1 :
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qualifier == 'h' ? 2 :
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qualifier == 'l' ? 4 : -1;
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*type = *fmt++;
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/* that should be it! */
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if (*fmt)
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return -1;
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return 0;
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}
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void utilfdt_print_data(const char *data, int len)
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{
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int i;
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const char *s;
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/* no data, don't print */
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if (len == 0)
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return;
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if (util_is_printable_string(data, len)) {
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printf(" = ");
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s = data;
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do {
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printf("\"%s\"", s);
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s += strlen(s) + 1;
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if (s < data + len)
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printf(", ");
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} while (s < data + len);
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} else if ((len % 4) == 0) {
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const fdt32_t *cell = (const fdt32_t *)data;
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printf(" = <");
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for (i = 0, len /= 4; i < len; i++)
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printf("0x%08x%s", fdt32_to_cpu(cell[i]),
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i < (len - 1) ? " " : "");
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printf(">");
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} else {
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const unsigned char *p = (const unsigned char *)data;
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printf(" = [");
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for (i = 0; i < len; i++)
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printf("%02x%s", *p++, i < len - 1 ? " " : "");
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printf("]");
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}
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}
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void NORETURN util_version(void)
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{
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printf("Version: %s\n", DTC_VERSION);
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exit(0);
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}
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void NORETURN util_usage(const char *errmsg, const char *synopsis,
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const char *short_opts,
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struct option const long_opts[],
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const char * const opts_help[])
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{
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FILE *fp = errmsg ? stderr : stdout;
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const char a_arg[] = "<arg>";
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size_t a_arg_len = strlen(a_arg) + 1;
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size_t i;
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int optlen;
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fprintf(fp,
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"Usage: %s\n"
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"\n"
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"Options: -[%s]\n", synopsis, short_opts);
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/* prescan the --long opt length to auto-align */
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optlen = 0;
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for (i = 0; long_opts[i].name; ++i) {
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/* +1 is for space between --opt and help text */
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int l = strlen(long_opts[i].name) + 1;
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if (long_opts[i].has_arg == a_argument)
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l += a_arg_len;
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if (optlen < l)
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optlen = l;
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}
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for (i = 0; long_opts[i].name; ++i) {
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/* helps when adding new applets or options */
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assert(opts_help[i] != NULL);
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/* first output the short flag if it has one */
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if (long_opts[i].val > '~')
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fprintf(fp, " ");
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else
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fprintf(fp, " -%c, ", long_opts[i].val);
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/* then the long flag */
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if (long_opts[i].has_arg == no_argument)
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fprintf(fp, "--%-*s", optlen, long_opts[i].name);
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else
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fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
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(int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
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/* finally the help text */
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fprintf(fp, "%s\n", opts_help[i]);
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}
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if (errmsg) {
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fprintf(fp, "\nError: %s\n", errmsg);
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exit(EXIT_FAILURE);
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} else
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exit(EXIT_SUCCESS);
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}
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