125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/* vsnprintf( char *, size_t, const char *, va_list )
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This file is part of the Public Domain C Library (PDCLib).
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Permission is granted to use, modify, and / or redistribute at will.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#ifndef REGTEST
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#include "_PDCLIB_io.h"
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/* returns true if callback-based output succeeded; else false */
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static inline bool cbout(
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struct _PDCLIB_status_t * status,
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const char *buf,
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size_t size )
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{
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size_t rv = status->write( status->ctx, buf, size );
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status->i += rv;
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return rv == size;
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}
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int _vcbprintf(
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void *p,
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size_t ( *cb ) ( void *p, const char *buf, size_t size ),
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const char *format,
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va_list arg )
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{
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struct _PDCLIB_status_t status;
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status.base = 0;
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status.flags = 0;
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status.n = 0;
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status.i = 0;
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status.current = 0;
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status.width = 0;
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status.prec = 0;
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status.ctx = p;
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status.write = cb;
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va_copy( status.arg, arg );
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/* Alternate between outputing runs of verbatim text and conversions */
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while ( *format != '\0' )
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{
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const char *mark = format;
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while ( *format != '\0' && *format != '%')
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{
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format++;
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}
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if ( mark != format )
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{
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if ( !cbout(&status, mark, format - mark) )
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return -1;
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}
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if ( *format == '%' ) {
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int consumed = _PDCLIB_print( format, &status );
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if ( consumed > 0 )
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{
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format += consumed;
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}
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else if ( consumed == 0 )
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{
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/* not a conversion specifier, print verbatim */
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if ( !cbout(&status, format++, 1) )
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return -1;
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}
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else
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{
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/* I/O callback error */
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return -1;
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}
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}
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}
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va_end( status.arg );
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return status.i;
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}
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#endif
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#ifdef TEST
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#define _PDCLIB_FILEID "stdio/_vcbprintf.c"
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#define _PDCLIB_STRINGIO
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#include <stdint.h>
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#include <stddef.h>
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#include "_PDCLIB_test.h"
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#ifndef REGTEST
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static size_t testcb( void *p, const char *buf, size_t size )
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{
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char **destbuf = p;
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memcpy(*destbuf, buf, size);
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*destbuf += size;
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return size;
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}
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static int testprintf( char * s, const char * format, ... )
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{
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int i;
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va_list arg;
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va_start( arg, format );
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i = _vcbprintf( &s, testcb, format, arg );
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*s = 0;
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va_end( arg );
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return i;
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}
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#endif
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int main( void )
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{
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#ifndef REGTEST
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char target[100];
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#include "printf_testcases.h"
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#endif
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return TEST_RESULTS;
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}
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#endif
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