// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Copyright 2011 The Chromium Authors, All Rights Reserved.

 * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.

 *

 * util_is_printable_string contributed by

 *	Pantelis Antoniou <pantelis.antoniou AT gmail.com>

 */

#include <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <string.h>

#include <assert.h>

#include <inttypes.h>

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

#include "libfdt.h"

#include "util.h"

#include "version_gen.h"

char *xstrdup(const char *s)

{

	int len = strlen(s) + 1;

	char *d = xmalloc(len);

	memcpy(d, s, len);

	return d;

}

int xavsprintf_append(char **strp, const char *fmt, va_list ap)

{

	int n, size = 0;	/* start with 128 bytes */

	char *p;

	va_list ap_copy;

	p = *strp;

	if (p)

		size = strlen(p);

	va_copy(ap_copy, ap);

	n = vsnprintf(NULL, 0, fmt, ap_copy) + 1;

	va_end(ap_copy);

	p = xrealloc(p, size + n);

	n = vsnprintf(p + size, n, fmt, ap);

	*strp = p;

	return strlen(p);

}

int xasprintf_append(char **strp, const char *fmt, ...)

{

	int n;

	va_list ap;

	va_start(ap, fmt);

	n = xavsprintf_append(strp, fmt, ap);

	va_end(ap);

	return n;

}

int xasprintf(char **strp, const char *fmt, ...)

{

	int n;

	va_list ap;

	*strp = NULL;

	va_start(ap, fmt);

	n = xavsprintf_append(strp, fmt, ap);

	va_end(ap);

	return n;

}

char *join_path(const char *path, const char *name)

{

	int lenp = strlen(path);

	int lenn = strlen(name);

	int len;

	int needslash = 1;

	char *str;

	len = lenp + lenn + 2;

	if ((lenp > 0) && (path[lenp-1] == '/')) {

		needslash = 0;

		len--;

	}

	str = xmalloc(len);

	memcpy(str, path, lenp);

	if (needslash) {

		str[lenp] = '/';

		lenp++;

	}

	memcpy(str+lenp, name, lenn+1);

	return str;

}

bool util_is_printable_string(const void *data, int len)

{

	const char *s = data;

	const char *ss, *se;

	/* zero length is not */

	if (len == 0)

		return 0;

	/* must terminate with zero */

	if (s[len - 1] != '\0')

		return 0;

	se = s + len;

	while (s < se) {

		ss = s;

		while (s < se && *s && isprint((unsigned char)*s))

			s++;

		/* not zero, or not done yet */

		if (*s != '\0' || s == ss)

			return 0;

		s++;

	}

	return 1;

}

/*

 * Parse a octal encoded character starting at index i in string s.  The

 * resulting character will be returned and the index i will be updated to

 * point at the character directly after the end of the encoding, this may be

 * the '\0' terminator of the string.

 */

static char get_oct_char(const char *s, int *i)

{

	char x[4];

	char *endx;

	long val;

	x[3] = '\0';

	strncpy(x, s + *i, 3);

	val = strtol(x, &endx, 8);

	assert(endx > x);

	(*i) += endx - x;

	return val;

}

/*

 * Parse a hexadecimal encoded character starting at index i in string s.  The

 * resulting character will be returned and the index i will be updated to

 * point at the character directly after the end of the encoding, this may be

 * the '\0' terminator of the string.

 */

static char get_hex_char(const char *s, int *i)

{

	char x[3];

	char *endx;

	long val;

	x[2] = '\0';

	strncpy(x, s + *i, 2);

	val = strtol(x, &endx, 16);

	if (!(endx  > x))

		die("\\x used with no following hex digits\n");

	(*i) += endx - x;

	return val;

}

char get_escape_char(const char *s, int *i)

{

	char	c = s[*i];

	int	j = *i + 1;

	char	val;

	switch (c) {

	case 'a':

		val = '\a';

		break;

	case 'b':

		val = '\b';

		break;

	case 't':

		val = '\t';

		break;

	case 'n':

		val = '\n';

		break;

	case 'v':

		val = '\v';

		break;

	case 'f':

		val = '\f';

		break;

	case 'r':

		val = '\r';

		break;

	case '0':

	case '1':

	case '2':

	case '3':

	case '4':

	case '5':

	case '6':

	case '7':

		j--; /* need to re-read the first digit as

		      * part of the octal value */

		val = get_oct_char(s, &j);

		break;

	case 'x':

		val = get_hex_char(s, &j);

		break;

	default:

		val = c;

	}

	(*i) = j;

	return val;

}

int utilfdt_read_err(const char *filename, char **buffp, size_t *len)

{

	int fd = 0;	/* assume stdin */

	char *buf = NULL;

	size_t bufsize = 1024, offset = 0;

	int ret = 0;

	*buffp = NULL;

	if (strcmp(filename, "-") != 0) {

		fd = open(filename, O_RDONLY);

		if (fd < 0)

			return errno;

	}

	/* Loop until we have read everything */

	buf = xmalloc(bufsize);

	do {

		/* Expand the buffer to hold the next chunk */

		if (offset == bufsize) {

			bufsize *= 2;

			buf = xrealloc(buf, bufsize);

		}

		ret = read(fd, &buf[offset], bufsize - offset);

		if (ret < 0) {

			ret = errno;

			break;

		}

		offset += ret;

	} while (ret != 0);

	/* Clean up, including closing stdin; return errno on error */

	close(fd);

	if (ret)

		free(buf);

	else

		*buffp = buf;

	if (len)

		*len = bufsize;

	return ret;

}

char *utilfdt_read(const char *filename, size_t *len)

{

	char *buff;

	int ret = utilfdt_read_err(filename, &buff, len);

	if (ret) {

		fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,

			strerror(ret));

		return NULL;

	}

	/* Successful read */

	return buff;

}

int utilfdt_write_err(const char *filename, const void *blob)

{

	int fd = 1;	/* assume stdout */

	int totalsize;

	int offset;

	int ret = 0;

	const char *ptr = blob;

	if (strcmp(filename, "-") != 0) {

		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);

		if (fd < 0)

			return errno;

	}

	totalsize = fdt_totalsize(blob);

	offset = 0;

	while (offset < totalsize) {

		ret = write(fd, ptr + offset, totalsize - offset);

		if (ret < 0) {

			ret = -errno;

			break;

		}

		offset += ret;

	}

	/* Close the file/stdin; return errno on error */

	if (fd != 1)

		close(fd);

	return ret < 0 ? -ret : 0;

}

int utilfdt_write(const char *filename, const void *blob)

{

	int ret = utilfdt_write_err(filename, blob);

	if (ret) {

		fprintf(stderr, "Couldn't write blob to '%s': %s\n", filename,

			strerror(ret));

	}

	return ret ? -1 : 0;

}

int utilfdt_decode_type(const char *fmt, int *type, int *size)

{

	int qualifier = 0;

	if (!*fmt)

		return -1;

	/* get the conversion qualifier */

	*size = -1;

	if (strchr("hlLb", *fmt)) {

		qualifier = *fmt++;

		if (qualifier == *fmt) {

			switch (*fmt++) {

/* TODO:		case 'l': qualifier = 'L'; break;*/

			case 'h':

				qualifier = 'b';

				break;

			}

		}

	}

	/* we should now have a type */

	if ((*fmt == '\0') || !strchr("iuxs", *fmt))

		return -1;

	/* convert qualifier (bhL) to byte size */

	if (*fmt != 's')

		*size = qualifier == 'b' ? 1 :

				qualifier == 'h' ? 2 :

				qualifier == 'l' ? 4 : -1;

	*type = *fmt++;

	/* that should be it! */

	if (*fmt)

		return -1;

	return 0;

}

void utilfdt_print_data(const char *data, int len)

{

	int i;

	const char *s;

	/* no data, don't print */

	if (len == 0)

		return;

	if (util_is_printable_string(data, len)) {

		printf(" = ");

		s = data;

		do {

			printf("\"%s\"", s);

			s += strlen(s) + 1;

			if (s < data + len)

				printf(", ");

		} while (s < data + len);

	} else if ((len % 4) == 0) {

		const fdt32_t *cell = (const fdt32_t *)data;

		printf(" = <");

		for (i = 0, len /= 4; i < len; i++)

			printf("0x%08" PRIx32 "%s", fdt32_to_cpu(cell[i]),

			       i < (len - 1) ? " " : "");

		printf(">");

	} else {

		const unsigned char *p = (const unsigned char *)data;

		printf(" = [");

		for (i = 0; i < len; i++)

			printf("%02x%s", *p++, i < len - 1 ? " " : "");

		printf("]");

	}

}

void NORETURN util_version(void)

{

	printf("Version: %s\n", DTC_VERSION);

	exit(0);

}

void NORETURN util_usage(const char *errmsg, const char *synopsis,

			 const char *short_opts,

			 struct option const long_opts[],

			 const char * const opts_help[])

{

	FILE *fp = errmsg ? stderr : stdout;

	const char a_arg[] = "<arg>";

	size_t a_arg_len = strlen(a_arg) + 1;

	size_t i;

	int optlen;

	fprintf(fp,

		"Usage: %s\n"

		"\n"

		"Options: -[%s]\n", synopsis, short_opts);

	/* prescan the --long opt length to auto-align */

	optlen = 0;

	for (i = 0; long_opts[i].name; ++i) {

		/* +1 is for space between --opt and help text */

		int l = strlen(long_opts[i].name) + 1;

		if (long_opts[i].has_arg == a_argument)

			l += a_arg_len;

		if (optlen < l)

			optlen = l;

	}

	for (i = 0; long_opts[i].name; ++i) {

		/* helps when adding new applets or options */

		assert(opts_help[i] != NULL);

		/* first output the short flag if it has one */

		if (long_opts[i].val > '~')

			fprintf(fp, "      ");

		else

			fprintf(fp, "  -%c, ", long_opts[i].val);

		/* then the long flag */

		if (long_opts[i].has_arg == no_argument)

			fprintf(fp, "--%-*s", optlen, long_opts[i].name);

		else

			fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,

				(int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");

		/* finally the help text */

		fprintf(fp, "%s\n", opts_help[i]);

	}

	if (errmsg) {

		fprintf(fp, "\nError: %s\n", errmsg);

		exit(EXIT_FAILURE);

	} else

		exit(EXIT_SUCCESS);

}