Blame src/utils.c

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// SPDX-License-Identifier: GPL-2.0
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/*
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 * utils: set of common functions
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 *
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 * Copyright (C) 2020 Patrick Uiterwijk <patrick@puiterwijk.org>
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 * Copyright (C) 2010 Cyril Hrubis <chrubis@suse.cz>
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 */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "utils.h"
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#ifndef MIN
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# define MIN(a, b) ({ \
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	typeof(a) _a = (a); \
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	typeof(b) _b = (b); \
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	_a < _b ? _a : _b; \
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})
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#endif /* MIN */
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static int file_exist(const char *path)
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{
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	struct stat st;
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	if (!access(path, R_OK) && !stat(path, &st) && S_ISREG(st.st_mode))
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		return 1;
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	return 0;
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}
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int get_cmd_path(const char *prog_name, char *buf, size_t buf_len)
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{
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	const char *path = (const char *)getenv("PATH");
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	const char *start = path;
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	const char *end;
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	size_t size, ret;
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	if (path == NULL)
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		return -1;
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	do {
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		end = strchr(start, ':');
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		if (end != NULL)
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			snprintf(buf, MIN(buf_len, (size_t) (end - start + 1)),
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				 "%s", start);
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		else
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			snprintf(buf, buf_len, "%s", start);
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		size = strlen(buf);
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		/*
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		 * "::" inside $PATH, $PATH ending with ':' or $PATH starting
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		 * with ':' should be expanded into current working directory.
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		 */
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		if (size == 0) {
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			snprintf(buf, buf_len, ".");
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			size = strlen(buf);
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		}
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		/*
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		 * If there is no '/' ad the end of path from $PATH add it.
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		 */
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		if (buf[size - 1] != '/')
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			ret =
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			    snprintf(buf + size, buf_len - size, "/%s",
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				     prog_name);
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		else
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			ret =
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			    snprintf(buf + size, buf_len - size, "%s",
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				     prog_name);
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		if (buf_len - size > ret && file_exist(buf))
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			return 0;
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		start = end + 1;
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	} while (end != NULL);
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	return -1;
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}
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int hex_to_bin(char ch)
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{
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	if ((ch >= '0') && (ch <= '9'))
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		return ch - '0';
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	ch = tolower(ch);
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	if ((ch >= 'a') && (ch <= 'f'))
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		return ch - 'a' + 10;
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	return -1;
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}
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int hex2bin(void *dst, const char *src, size_t count)
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{
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	int hi, lo;
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	while (count--) {
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		if (*src == ' ')
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			src++;
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		hi = hex_to_bin(*src++);
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		lo = hex_to_bin(*src++);
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		if ((hi < 0) || (lo < 0))
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			return -1;
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		*(uint8_t *)dst++ = (hi << 4) | lo;
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	}
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	return 0;
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}