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/* ----------------------------------------------------------------------- *
*
* Copyright 2004 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* argv.c
*
* Parse a single C string into argc and argv (argc is return value.)
* memptr points to available memory.
*/
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#define ALIGN_UP(p,t) ((t *)(((uintptr_t)(p) + (sizeof(t)-1)) & ~(sizeof(t)-1)))
extern char _end[]; /* Symbol created by linker */
void *__mem_end = &_end; /* Global variable for use by malloc() */
int __parse_argv(char ***argv, const char *str)
{
char *mem = __mem_end;
const char *p = str;
char *q = mem;
char *r;
char **arg;
int wasspace = 0;
int argc = 1;
/* First copy the string, turning whitespace runs into nulls */
for ( p = str ; ; p++ ) {
if ( *p <= ' ' ) {
if ( !wasspace ) {
wasspace = 1;
*q++ = '\0';
}
} else {
if ( wasspace ) {
argc++;
wasspace = 0;
}
*q++ = *p;
}
/* This test is AFTER we have processed the null byte;
we treat it as a whitespace character so it terminates
the last argument */
if ( ! *p )
break;
}
/* Now create argv */
arg = ALIGN_UP(q,char *);
*argv = arg;
*arg++ = mem; /* argv[0] */
q--; /* Point q to final null */
for ( r = mem ; r < q ; r++ ) {
if ( *r == '\0' ) {
*arg++ = r+1;
}
}
*arg++ = NULL; /* Null pointer at the end */
__mem_end = arg; /* End of memory we used */
return argc;
}
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