mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
185f812c41
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
547 lines
11 KiB
C
547 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2008 Freescale Semiconductor, Inc.
|
|
* Copyright 2013 Wolfgang Denk <wd@denx.de>
|
|
*/
|
|
|
|
/*
|
|
* This file provides a shell like 'expr' function to return.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <config.h>
|
|
#include <command.h>
|
|
#include <ctype.h>
|
|
#include <env.h>
|
|
#include <log.h>
|
|
#include <malloc.h>
|
|
#include <mapmem.h>
|
|
#include <linux/sizes.h>
|
|
#include "printf.h"
|
|
|
|
#define MAX_STR_LEN 128
|
|
|
|
/**
|
|
* struct expr_arg: Holds an argument to an expression
|
|
*
|
|
* @ival: Integer value (if width is not CMD_DATA_SIZE_STR)
|
|
* @sval: String value (if width is CMD_DATA_SIZE_STR)
|
|
*/
|
|
struct expr_arg {
|
|
union {
|
|
ulong ival;
|
|
char *sval;
|
|
};
|
|
};
|
|
|
|
static int get_arg(char *s, int w, struct expr_arg *argp)
|
|
{
|
|
struct expr_arg arg;
|
|
|
|
/*
|
|
* If the parameter starts with a '*' then assume it is a pointer to
|
|
* the value we want.
|
|
*/
|
|
if (s[0] == '*') {
|
|
ulong *p;
|
|
ulong addr;
|
|
ulong val;
|
|
int len;
|
|
char *str;
|
|
|
|
addr = hextoul(&s[1], NULL);
|
|
switch (w) {
|
|
case 1:
|
|
p = map_sysmem(addr, sizeof(uchar));
|
|
val = (ulong)*(uchar *)p;
|
|
unmap_sysmem(p);
|
|
arg.ival = val;
|
|
break;
|
|
case 2:
|
|
p = map_sysmem(addr, sizeof(ushort));
|
|
val = (ulong)*(ushort *)p;
|
|
unmap_sysmem(p);
|
|
arg.ival = val;
|
|
break;
|
|
case CMD_DATA_SIZE_STR:
|
|
p = map_sysmem(addr, SZ_64K);
|
|
|
|
/* Maximum string length of 64KB plus terminator */
|
|
len = strnlen((char *)p, SZ_64K) + 1;
|
|
str = malloc(len);
|
|
if (!str) {
|
|
printf("Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
memcpy(str, p, len);
|
|
str[len - 1] = '\0';
|
|
unmap_sysmem(p);
|
|
arg.sval = str;
|
|
break;
|
|
case 4:
|
|
p = map_sysmem(addr, sizeof(u32));
|
|
val = *(u32 *)p;
|
|
unmap_sysmem(p);
|
|
arg.ival = val;
|
|
break;
|
|
default:
|
|
p = map_sysmem(addr, sizeof(ulong));
|
|
val = *p;
|
|
unmap_sysmem(p);
|
|
arg.ival = val;
|
|
break;
|
|
}
|
|
} else {
|
|
if (w == CMD_DATA_SIZE_STR)
|
|
return -EINVAL;
|
|
arg.ival = hextoul(s, NULL);
|
|
}
|
|
*argp = arg;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_REGEX
|
|
|
|
#include <slre.h>
|
|
|
|
/*
|
|
* memstr - Find the first substring in memory
|
|
* @s1: The string to be searched
|
|
* @s2: The string to search for
|
|
*
|
|
* Similar to and based on strstr(),
|
|
* but strings do not need to be NUL terminated.
|
|
*/
|
|
static char *memstr(const char *s1, int l1, const char *s2, int l2)
|
|
{
|
|
if (!l2)
|
|
return (char *)s1;
|
|
|
|
while (l1 >= l2) {
|
|
l1--;
|
|
if (!memcmp(s1, s2, l2))
|
|
return (char *)s1;
|
|
s1++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* substitute() - Substitute part of one string with another
|
|
*
|
|
* This updates @string so that the first occurrence of @old is replaced with
|
|
* @new
|
|
*
|
|
* @string: String buffer containing string to update at the start
|
|
* @slen: Pointer to current string length, updated on success
|
|
* @ssize: Size of string buffer
|
|
* @old: Old string to find in the buffer (no terminator needed)
|
|
* @olen: Length of @old excluding terminator
|
|
* @new: New string to replace @old with
|
|
* @nlen: Length of @new excluding terminator
|
|
* Return: pointer to immediately after the copied @new in @string, or NULL if
|
|
* no replacement took place
|
|
*/
|
|
static char *substitute(char *string, int *slen, int ssize,
|
|
const char *old, int olen, const char *new, int nlen)
|
|
{
|
|
char *p = memstr(string, *slen, old, olen);
|
|
|
|
if (p == NULL)
|
|
return NULL;
|
|
|
|
debug("## Match at pos %ld: match len %d, subst len %d\n",
|
|
(long)(p - string), olen, nlen);
|
|
|
|
/* make sure replacement matches */
|
|
if (*slen + nlen - olen > ssize) {
|
|
printf("## error: substitution buffer overflow\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* move tail if needed */
|
|
if (olen != nlen) {
|
|
int tail, len;
|
|
|
|
len = (olen > nlen) ? olen : nlen;
|
|
|
|
tail = ssize - (p + len - string);
|
|
|
|
debug("## tail len %d\n", tail);
|
|
|
|
memmove(p + nlen, p + olen, tail);
|
|
}
|
|
|
|
/* insert substitute */
|
|
memcpy(p, new, nlen);
|
|
|
|
*slen += nlen - olen;
|
|
|
|
return p + nlen;
|
|
}
|
|
|
|
int setexpr_regex_sub(char *data, uint data_size, char *nbuf, uint nbuf_size,
|
|
const char *r, const char *s, bool global)
|
|
{
|
|
struct slre slre;
|
|
char *datap = data;
|
|
int res, len, nlen, loop;
|
|
|
|
if (slre_compile(&slre, r) == 0) {
|
|
printf("Error compiling regex: %s\n", slre.err_str);
|
|
return 1;
|
|
}
|
|
|
|
len = strlen(data);
|
|
for (loop = 0;; loop++) {
|
|
struct cap caps[slre.num_caps + 2];
|
|
const char *old;
|
|
char *np;
|
|
int i, olen;
|
|
|
|
(void) memset(caps, 0, sizeof(caps));
|
|
|
|
res = slre_match(&slre, datap, len - (datap - data), caps);
|
|
|
|
debug("Result: %d\n", res);
|
|
|
|
for (i = 0; i <= slre.num_caps; i++) {
|
|
if (caps[i].len > 0) {
|
|
debug("Substring %d: [%.*s]\n", i,
|
|
caps[i].len, caps[i].ptr);
|
|
}
|
|
}
|
|
|
|
if (res == 0) {
|
|
if (loop == 0) {
|
|
printf("%s: No match\n", data);
|
|
return 1;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
debug("## MATCH ## %s\n", data);
|
|
|
|
if (!s)
|
|
return 1;
|
|
|
|
old = caps[0].ptr;
|
|
olen = caps[0].len;
|
|
nlen = strlen(s);
|
|
|
|
if (nlen + 1 >= nbuf_size) {
|
|
printf("## error: pattern buffer overflow: have %d, need %d\n",
|
|
nbuf_size, nlen + 1);
|
|
return 1;
|
|
}
|
|
strcpy(nbuf, s);
|
|
|
|
debug("## SUBST(1) ## %s\n", nbuf);
|
|
|
|
/*
|
|
* Handle back references
|
|
*
|
|
* Support for \0 ... \9, where \0 is the
|
|
* whole matched pattern (similar to &).
|
|
*
|
|
* Implementation is a bit simpleminded as
|
|
* backrefs are substituted sequentially, one
|
|
* by one. This will lead to somewhat
|
|
* unexpected results if the replacement
|
|
* strings contain any \N strings then then
|
|
* may get substitued, too. We accept this
|
|
* restriction for the sake of simplicity.
|
|
*/
|
|
for (i = 0; i < 10; ++i) {
|
|
char backref[2] = {
|
|
'\\',
|
|
'0',
|
|
};
|
|
|
|
if (caps[i].len == 0)
|
|
break;
|
|
|
|
backref[1] += i;
|
|
|
|
debug("## BACKREF %d: replace \"%.*s\" by \"%.*s\" in \"%s\"\n",
|
|
i,
|
|
2, backref,
|
|
caps[i].len, caps[i].ptr,
|
|
nbuf);
|
|
|
|
for (np = nbuf;;) {
|
|
char *p = memstr(np, nlen, backref, 2);
|
|
|
|
if (p == NULL)
|
|
break;
|
|
|
|
np = substitute(np, &nlen,
|
|
nbuf_size - (np - nbuf),
|
|
backref, 2,
|
|
caps[i].ptr, caps[i].len);
|
|
|
|
if (np == NULL)
|
|
return 1;
|
|
}
|
|
}
|
|
debug("## SUBST(2) ## %s\n", nbuf);
|
|
|
|
datap = substitute(datap, &len, data_size - (datap - data),
|
|
old, olen, nbuf, nlen);
|
|
|
|
if (datap == NULL)
|
|
return 1;
|
|
|
|
debug("## REMAINDER: %s\n", datap);
|
|
|
|
debug("## RESULT: %s\n", data);
|
|
|
|
if (!global)
|
|
break;
|
|
}
|
|
debug("## FINAL (now env_set()) : %s\n", data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define SLRE_BUFSZ 16384
|
|
#define SLRE_PATSZ 4096
|
|
|
|
/*
|
|
* Perform regex operations on a environment variable
|
|
*
|
|
* Returns 0 if OK, 1 in case of errors.
|
|
*/
|
|
static int regex_sub_var(const char *name, const char *r, const char *s,
|
|
const char *t, int global)
|
|
{
|
|
struct slre slre;
|
|
char data[SLRE_BUFSZ];
|
|
char nbuf[SLRE_PATSZ];
|
|
const char *value;
|
|
int len;
|
|
int ret;
|
|
|
|
if (!name)
|
|
return 1;
|
|
|
|
if (slre_compile(&slre, r) == 0) {
|
|
printf("Error compiling regex: %s\n", slre.err_str);
|
|
return 1;
|
|
}
|
|
|
|
if (!t) {
|
|
value = env_get(name);
|
|
if (!value) {
|
|
printf("## Error: variable \"%s\" not defined\n", name);
|
|
return 1;
|
|
}
|
|
t = value;
|
|
}
|
|
|
|
debug("REGEX on %s=%s\n", name, t);
|
|
debug("REGEX=\"%s\", SUBST=\"%s\", GLOBAL=%d\n", r, s ? s : "<NULL>",
|
|
global);
|
|
|
|
len = strlen(t);
|
|
if (len + 1 > SLRE_BUFSZ) {
|
|
printf("## error: subst buffer overflow: have %d, need %d\n",
|
|
SLRE_BUFSZ, len + 1);
|
|
return 1;
|
|
}
|
|
|
|
strcpy(data, t);
|
|
|
|
ret = setexpr_regex_sub(data, SLRE_BUFSZ, nbuf, SLRE_PATSZ, r, s,
|
|
global);
|
|
if (ret)
|
|
return 1;
|
|
|
|
printf("%s=%s\n", name, data);
|
|
|
|
return env_set(name, data);
|
|
}
|
|
#endif
|
|
|
|
static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
struct expr_arg aval, bval;
|
|
ulong value;
|
|
int ret = 0;
|
|
int w;
|
|
|
|
/*
|
|
* We take 3, 5, or 6 arguments, except fmt operation, which
|
|
* takes 4 to 8 arguments (limited by _maxargs):
|
|
* 3 : setexpr name value
|
|
* 5 : setexpr name val1 op val2
|
|
* setexpr name [g]sub r s
|
|
* 6 : setexpr name [g]sub r s t
|
|
* setexpr name fmt format [val1] [val2] [val3] [val4]
|
|
*/
|
|
|
|
if (argc < 3)
|
|
return CMD_RET_USAGE;
|
|
|
|
w = cmd_get_data_size(argv[0], 4);
|
|
|
|
if (get_arg(argv[2], w, &aval))
|
|
return CMD_RET_FAILURE;
|
|
|
|
/* format string assignment: "setexpr name fmt %d value" */
|
|
if (strcmp(argv[2], "fmt") == 0 && IS_ENABLED(CONFIG_CMD_SETEXPR_FMT)) {
|
|
char str[MAX_STR_LEN];
|
|
int result;
|
|
|
|
if (argc == 3)
|
|
return CMD_RET_USAGE;
|
|
|
|
result = printf_setexpr(str, sizeof(str), argc - 3, &argv[3]);
|
|
if (result)
|
|
return result;
|
|
|
|
return env_set(argv[1], str);
|
|
}
|
|
|
|
if (argc == 4 || argc > 6)
|
|
return CMD_RET_USAGE;
|
|
|
|
/* plain assignment: "setexpr name value" */
|
|
if (argc == 3) {
|
|
if (w == CMD_DATA_SIZE_STR) {
|
|
ret = env_set(argv[1], aval.sval);
|
|
free(aval.sval);
|
|
} else {
|
|
ret = env_set_hex(argv[1], aval.ival);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* 5 or 6 args (6 args only with [g]sub) */
|
|
#ifdef CONFIG_REGEX
|
|
/*
|
|
* rexep handling: "setexpr name [g]sub r s [t]"
|
|
* with 5 args, "t" will be NULL
|
|
*/
|
|
if (strcmp(argv[2], "gsub") == 0)
|
|
return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 1);
|
|
|
|
if (strcmp(argv[2], "sub") == 0)
|
|
return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 0);
|
|
#endif
|
|
|
|
/* standard operators: "setexpr name val1 op val2" */
|
|
if (argc != 5)
|
|
return CMD_RET_USAGE;
|
|
|
|
if (strlen(argv[3]) != 1)
|
|
return CMD_RET_USAGE;
|
|
|
|
if (get_arg(argv[4], w, &bval)) {
|
|
if (w == CMD_DATA_SIZE_STR)
|
|
free(aval.sval);
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
if (w == CMD_DATA_SIZE_STR) {
|
|
int len;
|
|
char *str;
|
|
|
|
switch (argv[3][0]) {
|
|
case '+':
|
|
len = strlen(aval.sval) + strlen(bval.sval) + 1;
|
|
str = malloc(len);
|
|
if (!str) {
|
|
printf("Out of memory\n");
|
|
ret = CMD_RET_FAILURE;
|
|
} else {
|
|
/* These were copied out and checked earlier */
|
|
strcpy(str, aval.sval);
|
|
strcat(str, bval.sval);
|
|
ret = env_set(argv[1], str);
|
|
if (ret)
|
|
printf("Could not set var\n");
|
|
free(str);
|
|
}
|
|
break;
|
|
default:
|
|
printf("invalid op\n");
|
|
ret = 1;
|
|
}
|
|
} else {
|
|
ulong a = aval.ival;
|
|
ulong b = bval.ival;
|
|
|
|
switch (argv[3][0]) {
|
|
case '|':
|
|
value = a | b;
|
|
break;
|
|
case '&':
|
|
value = a & b;
|
|
break;
|
|
case '+':
|
|
value = a + b;
|
|
break;
|
|
case '^':
|
|
value = a ^ b;
|
|
break;
|
|
case '-':
|
|
value = a - b;
|
|
break;
|
|
case '*':
|
|
value = a * b;
|
|
break;
|
|
case '/':
|
|
value = a / b;
|
|
break;
|
|
case '%':
|
|
value = a % b;
|
|
break;
|
|
default:
|
|
printf("invalid op\n");
|
|
return 1;
|
|
}
|
|
|
|
env_set_hex(argv[1], value);
|
|
}
|
|
|
|
if (w == CMD_DATA_SIZE_STR) {
|
|
free(aval.sval);
|
|
free(bval.sval);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
setexpr, 8, 0, do_setexpr,
|
|
"set environment variable as the result of eval expression",
|
|
"[.b, .w, .l, .s] name [*]value1 <op> [*]value2\n"
|
|
" - set environment variable 'name' to the result of the evaluated\n"
|
|
" expression specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n"
|
|
" (for strings only + is supported)\n"
|
|
" size argument is only meaningful if value1 and/or value2 are\n"
|
|
" memory addresses (*)\n"
|
|
"setexpr[.b, .w, .l] name [*]value\n"
|
|
" - load a value into a variable"
|
|
#ifdef CONFIG_CMD_SETEXPR_FMT
|
|
"\n"
|
|
"setexpr name fmt <format> [value1] [value2] [value3] [value4]\n"
|
|
" - set environment variable 'name' to the result of the bash like\n"
|
|
" format string evaluation of value."
|
|
#endif
|
|
#ifdef CONFIG_REGEX
|
|
"\n"
|
|
"setexpr name gsub r s [t]\n"
|
|
" - For each substring matching the regular expression <r> in the\n"
|
|
" string <t>, substitute the string <s>. The result is\n"
|
|
" assigned to <name>. If <t> is not supplied, use the old\n"
|
|
" value of <name>\n"
|
|
"setexpr name sub r s [t]\n"
|
|
" - Just like gsub(), but replace only the first matching substring"
|
|
#endif
|
|
);
|