59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
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* Copyright (c) 2012, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdio/vsscanf.c
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* Input format conversion.
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*/
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#include <assert.h>
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#include <stdio.h>
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struct vsscanf_input
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{
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union
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{
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const char* str;
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const unsigned char* ustr;
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};
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size_t offset;
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};
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static int vsscanf_fgetc(void* fp)
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{
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struct vsscanf_input* input = (struct vsscanf_input*) fp;
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if ( !input->ustr[input->offset] )
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return EOF;
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return (int) input->ustr[input->offset++];
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}
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static int vsscanf_ungetc(int c, void* fp)
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{
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struct vsscanf_input* input = (struct vsscanf_input*) fp;
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if ( c == EOF && !input->ustr[input->offset] )
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return c;
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assert(input->offset);
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input->offset--;
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assert(input->ustr[input->offset] == (unsigned char) c);
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return c;
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}
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int vsscanf(const char* str, const char* format, va_list ap)
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{
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struct vsscanf_input input;
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input.str = str;
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input.offset = 0;
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return vcbscanf(&input, vsscanf_fgetc, vsscanf_ungetc, format, ap);
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}
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