mirror of https://gitee.com/openkylin/linux.git
340 lines
6.1 KiB
C
340 lines
6.1 KiB
C
#include "string.h"
|
|
#include "util.h"
|
|
|
|
static int hex(char ch)
|
|
{
|
|
if ((ch >= '0') && (ch <= '9'))
|
|
return ch - '0';
|
|
if ((ch >= 'a') && (ch <= 'f'))
|
|
return ch - 'a' + 10;
|
|
if ((ch >= 'A') && (ch <= 'F'))
|
|
return ch - 'A' + 10;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* While we find nice hex chars, build a long_val.
|
|
* Return number of chars processed.
|
|
*/
|
|
int hex2u64(const char *ptr, u64 *long_val)
|
|
{
|
|
const char *p = ptr;
|
|
*long_val = 0;
|
|
|
|
while (*p) {
|
|
const int hex_val = hex(*p);
|
|
|
|
if (hex_val < 0)
|
|
break;
|
|
|
|
*long_val = (*long_val << 4) | hex_val;
|
|
p++;
|
|
}
|
|
|
|
return p - ptr;
|
|
}
|
|
|
|
char *strxfrchar(char *s, char from, char to)
|
|
{
|
|
char *p = s;
|
|
|
|
while ((p = strchr(p, from)) != NULL)
|
|
*p++ = to;
|
|
|
|
return s;
|
|
}
|
|
|
|
#define K 1024LL
|
|
/*
|
|
* perf_atoll()
|
|
* Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
|
|
* and return its numeric value
|
|
*/
|
|
s64 perf_atoll(const char *str)
|
|
{
|
|
unsigned int i;
|
|
s64 length = -1, unit = 1;
|
|
|
|
if (!isdigit(str[0]))
|
|
goto out_err;
|
|
|
|
for (i = 1; i < strlen(str); i++) {
|
|
switch (str[i]) {
|
|
case 'B':
|
|
case 'b':
|
|
break;
|
|
case 'K':
|
|
if (str[i + 1] != 'B')
|
|
goto out_err;
|
|
else
|
|
goto kilo;
|
|
case 'k':
|
|
if (str[i + 1] != 'b')
|
|
goto out_err;
|
|
kilo:
|
|
unit = K;
|
|
break;
|
|
case 'M':
|
|
if (str[i + 1] != 'B')
|
|
goto out_err;
|
|
else
|
|
goto mega;
|
|
case 'm':
|
|
if (str[i + 1] != 'b')
|
|
goto out_err;
|
|
mega:
|
|
unit = K * K;
|
|
break;
|
|
case 'G':
|
|
if (str[i + 1] != 'B')
|
|
goto out_err;
|
|
else
|
|
goto giga;
|
|
case 'g':
|
|
if (str[i + 1] != 'b')
|
|
goto out_err;
|
|
giga:
|
|
unit = K * K * K;
|
|
break;
|
|
case 'T':
|
|
if (str[i + 1] != 'B')
|
|
goto out_err;
|
|
else
|
|
goto tera;
|
|
case 't':
|
|
if (str[i + 1] != 'b')
|
|
goto out_err;
|
|
tera:
|
|
unit = K * K * K * K;
|
|
break;
|
|
case '\0': /* only specified figures */
|
|
unit = 1;
|
|
break;
|
|
default:
|
|
if (!isdigit(str[i]))
|
|
goto out_err;
|
|
break;
|
|
}
|
|
}
|
|
|
|
length = atoll(str) * unit;
|
|
goto out;
|
|
|
|
out_err:
|
|
length = -1;
|
|
out:
|
|
return length;
|
|
}
|
|
|
|
/*
|
|
* Helper function for splitting a string into an argv-like array.
|
|
* originaly copied from lib/argv_split.c
|
|
*/
|
|
static const char *skip_sep(const char *cp)
|
|
{
|
|
while (*cp && isspace(*cp))
|
|
cp++;
|
|
|
|
return cp;
|
|
}
|
|
|
|
static const char *skip_arg(const char *cp)
|
|
{
|
|
while (*cp && !isspace(*cp))
|
|
cp++;
|
|
|
|
return cp;
|
|
}
|
|
|
|
static int count_argc(const char *str)
|
|
{
|
|
int count = 0;
|
|
|
|
while (*str) {
|
|
str = skip_sep(str);
|
|
if (*str) {
|
|
count++;
|
|
str = skip_arg(str);
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* argv_free - free an argv
|
|
* @argv - the argument vector to be freed
|
|
*
|
|
* Frees an argv and the strings it points to.
|
|
*/
|
|
void argv_free(char **argv)
|
|
{
|
|
char **p;
|
|
for (p = argv; *p; p++)
|
|
free(*p);
|
|
|
|
free(argv);
|
|
}
|
|
|
|
/**
|
|
* argv_split - split a string at whitespace, returning an argv
|
|
* @str: the string to be split
|
|
* @argcp: returned argument count
|
|
*
|
|
* Returns an array of pointers to strings which are split out from
|
|
* @str. This is performed by strictly splitting on white-space; no
|
|
* quote processing is performed. Multiple whitespace characters are
|
|
* considered to be a single argument separator. The returned array
|
|
* is always NULL-terminated. Returns NULL on memory allocation
|
|
* failure.
|
|
*/
|
|
char **argv_split(const char *str, int *argcp)
|
|
{
|
|
int argc = count_argc(str);
|
|
char **argv = zalloc(sizeof(*argv) * (argc+1));
|
|
char **argvp;
|
|
|
|
if (argv == NULL)
|
|
goto out;
|
|
|
|
if (argcp)
|
|
*argcp = argc;
|
|
|
|
argvp = argv;
|
|
|
|
while (*str) {
|
|
str = skip_sep(str);
|
|
|
|
if (*str) {
|
|
const char *p = str;
|
|
char *t;
|
|
|
|
str = skip_arg(str);
|
|
|
|
t = strndup(p, str-p);
|
|
if (t == NULL)
|
|
goto fail;
|
|
*argvp++ = t;
|
|
}
|
|
}
|
|
*argvp = NULL;
|
|
|
|
out:
|
|
return argv;
|
|
|
|
fail:
|
|
argv_free(argv);
|
|
return NULL;
|
|
}
|
|
|
|
/* Character class matching */
|
|
static bool __match_charclass(const char *pat, char c, const char **npat)
|
|
{
|
|
bool complement = false, ret = true;
|
|
|
|
if (*pat == '!') {
|
|
complement = true;
|
|
pat++;
|
|
}
|
|
if (*pat++ == c) /* First character is special */
|
|
goto end;
|
|
|
|
while (*pat && *pat != ']') { /* Matching */
|
|
if (*pat == '-' && *(pat + 1) != ']') { /* Range */
|
|
if (*(pat - 1) <= c && c <= *(pat + 1))
|
|
goto end;
|
|
if (*(pat - 1) > *(pat + 1))
|
|
goto error;
|
|
pat += 2;
|
|
} else if (*pat++ == c)
|
|
goto end;
|
|
}
|
|
if (!*pat)
|
|
goto error;
|
|
ret = false;
|
|
|
|
end:
|
|
while (*pat && *pat != ']') /* Searching closing */
|
|
pat++;
|
|
if (!*pat)
|
|
goto error;
|
|
*npat = pat + 1;
|
|
return complement ? !ret : ret;
|
|
|
|
error:
|
|
return false;
|
|
}
|
|
|
|
/* Glob/lazy pattern matching */
|
|
static bool __match_glob(const char *str, const char *pat, bool ignore_space)
|
|
{
|
|
while (*str && *pat && *pat != '*') {
|
|
if (ignore_space) {
|
|
/* Ignore spaces for lazy matching */
|
|
if (isspace(*str)) {
|
|
str++;
|
|
continue;
|
|
}
|
|
if (isspace(*pat)) {
|
|
pat++;
|
|
continue;
|
|
}
|
|
}
|
|
if (*pat == '?') { /* Matches any single character */
|
|
str++;
|
|
pat++;
|
|
continue;
|
|
} else if (*pat == '[') /* Character classes/Ranges */
|
|
if (__match_charclass(pat + 1, *str, &pat)) {
|
|
str++;
|
|
continue;
|
|
} else
|
|
return false;
|
|
else if (*pat == '\\') /* Escaped char match as normal char */
|
|
pat++;
|
|
if (*str++ != *pat++)
|
|
return false;
|
|
}
|
|
/* Check wild card */
|
|
if (*pat == '*') {
|
|
while (*pat == '*')
|
|
pat++;
|
|
if (!*pat) /* Tail wild card matches all */
|
|
return true;
|
|
while (*str)
|
|
if (strglobmatch(str++, pat))
|
|
return true;
|
|
}
|
|
return !*str && !*pat;
|
|
}
|
|
|
|
/**
|
|
* strglobmatch - glob expression pattern matching
|
|
* @str: the target string to match
|
|
* @pat: the pattern string to match
|
|
*
|
|
* This returns true if the @str matches @pat. @pat can includes wildcards
|
|
* ('*','?') and character classes ([CHARS], complementation and ranges are
|
|
* also supported). Also, this supports escape character ('\') to use special
|
|
* characters as normal character.
|
|
*
|
|
* Note: if @pat syntax is broken, this always returns false.
|
|
*/
|
|
bool strglobmatch(const char *str, const char *pat)
|
|
{
|
|
return __match_glob(str, pat, false);
|
|
}
|
|
|
|
/**
|
|
* strlazymatch - matching pattern strings lazily with glob pattern
|
|
* @str: the target string to match
|
|
* @pat: the pattern string to match
|
|
*
|
|
* This is similar to strglobmatch, except this ignores spaces in
|
|
* the target string.
|
|
*/
|
|
bool strlazymatch(const char *str, const char *pat)
|
|
{
|
|
return __match_glob(str, pat, true);
|
|
}
|