#include "util.h"
#include "string.h"
#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.
* originally 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 (__match_glob(str++, pat, ignore_space))
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);
}
/**
* strtailcmp - Compare the tail of two strings
* @s1: 1st string to be compared
* @s2: 2nd string to be compared
*
* Return 0 if whole of either string is same as another's tail part.
*/
int strtailcmp(const char *s1, const char *s2)
{
int i1 = strlen(s1);
int i2 = strlen(s2);
while (--i1 >= 0 && --i2 >= 0) {
if (s1[i1] != s2[i2])
return s1[i1] - s2[i2];
}
return 0;
}
