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/*
* Copyright (C) 2001 - 2004 Mike Wray <mike.wray@hp.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef __KERNEL__
# include <linux/config.h>
# include <linux/module.h>
# include <linux/kernel.h>
# include <linux/errno.h>
#else
# include <errno.h>
#endif
#include "allocate.h"
#include "sys_string.h"
/** Set the base to use for converting a string to a number. Base is
* hex if starts with 0x, otherwise decimal.
*
* @param s input string
* @param base where to put the base
* @return rest of s to parse as a number
*/
inline static const char * convert_set_base(const char *s, int *base){
*base = 10;
if(s){
if(*s=='0'){
s++;
if(*s=='x' || *s=='X'){
*base = 16;
s++;
}
}
}
return s;
}
/** Get the numerical value of a digit in the given base.
*
* @param c digit character
* @param base to use
* @return numerical value of digit in range 0..base-1 or
* -1 if not in range for the base
*/
inline static int convert_get_digit(char c, int base){
int d;
if('0'<=c && c<='9'){
d = c - '0';
} else if('a'<=c && c<='f'){
d = c - 'a' + 10;
} else if('A'<=c && c<='F'){
d = c - 'A' + 10;
} else {
d = -1;
}
return (d < base ? d : -1);
}
/** Convert a string to an unsigned long by parsing it as a number.
* Will accept hex or decimal in usual C syntax.
*
* @param str input string
* @param val where to put the result
* @return 0 if converted OK, negative otherwise
*/
int convert_atoul(const char *str, unsigned long *val){
int err = 0;
unsigned long v = 0;
int base;
const char *s = str;
if(!s) {
err = -EINVAL;
goto exit;
}
s = convert_set_base(s, &base);
for( ; !err && *s; s++){
int digit = convert_get_digit(*s, base);
if(digit<0){
err = -EINVAL;
goto exit;
}
v *= base;
v += digit;
}
exit:
*val = (err ? 0 : v);
return err;
}
/** Combine a directory path with a relative path to produce
* a new path.
*
* @param s directory path
* @param t relative path
* @return new combined path s/t
*/
int path_concat(char *s, char *t, char **val){
int err = 0;
int sn, tn, vn;
char *v;
sn = strlen(s);
if(sn > 0 && s[sn-1] == '/'){
sn--;
}
tn = strlen(t);
if(tn > 0 && t[0] == '/'){
tn--;
}
vn = sn+tn+1;
v = (char*)allocate(vn+1);
if(!v){
err = -ENOMEM;
goto exit;
}
strncpy(v, s, sn);
v[sn] = '/';
strncpy(v+sn+1, t, tn);
v[vn] = '\0';
exit:
*val = (err ? NULL : v);
return err;
}
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