221fa7d954
This change adds missing features: * %[ for pattern matching with a scanset. * %m for allocation of strings. * %p for pointers. * Field width for integers. The following features remain unimplemented, like with printf(3): * Floating point support. * Wide character support. * %n$ positional parameters. The code has been completely refactored to be much more maintainable. The implemented features should now be standards compliant. A large number of edge cases have been fixed. The vscanf_callback(3) function has been renamed to vcbscanf(3) and a new cbscanf(3) function has been added.
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2012, 2014 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* stdio/vsscanf.c
|
|
* Input format conversion.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
|
|
struct vsscanf_input
|
|
{
|
|
union
|
|
{
|
|
const char* str;
|
|
const unsigned char* ustr;
|
|
};
|
|
size_t offset;
|
|
};
|
|
|
|
static int vsscanf_fgetc(void* fp)
|
|
{
|
|
struct vsscanf_input* input = (struct vsscanf_input*) fp;
|
|
if ( !input->ustr[input->offset] )
|
|
return EOF;
|
|
return (int) input->ustr[input->offset++];
|
|
}
|
|
|
|
static int vsscanf_ungetc(int c, void* fp)
|
|
{
|
|
struct vsscanf_input* input = (struct vsscanf_input*) fp;
|
|
if ( c == EOF && !input->ustr[input->offset] )
|
|
return c;
|
|
assert(input->offset);
|
|
input->offset--;
|
|
assert(input->ustr[input->offset] == (unsigned char) c);
|
|
return c;
|
|
}
|
|
|
|
int vsscanf(const char* str, const char* format, va_list ap)
|
|
{
|
|
struct vsscanf_input input;
|
|
input.str = str;
|
|
input.offset = 0;
|
|
return vcbscanf(&input, vsscanf_fgetc, vsscanf_ungetc, format, ap);
|
|
}
|