64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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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 vscanf_callback(&input, vsscanf_fgetc, vsscanf_ungetc, format, ap);
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}
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