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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/lib/ppc405lib/sprintf.c $ */
/* */
/* OpenPOWER OnChipController Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2015,2016 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/// \file sprintf.c \brief Implementations of sprintf() and snprintf() using
/// StringStream.
#include "ssx.h"
#include "ssx_io.h"
#include "string_stream.h"
// sprintf() is easy - just blindly copy in the data.
static int
sprintf_swrite(FILE *stream, const void *buf, size_t size, size_t *written)
{
StringStream *string = (StringStream *)stream;
memcpy((void *)(&(string->data[string->next_write])), buf, size);
string->next_write += size;
*written = size;
return 0;
}
// snprintf() requires that bytes that won't fit in the array are simply
// discarded, but still accounted for. Note that vfprintf() is doing the
// high-level accounting.
static int
snprintf_swrite(FILE *stream, const void *buf, size_t size, size_t *written)
{
StringStream *string = (StringStream *)stream;
size_t to_write = MIN(size, string->size - string->next_write - 1);
memcpy((void *)(&(string->data[string->next_write])), buf, to_write);
string->next_write += to_write;
*written = size;
return 0;
}
// We use a StringStream to implement [v]sprintf() and [v]snprintf(). Once
// the formatting is finished the NULL terminator is added.
int
vsprintf(char *str, const char *format, va_list argp)
{
ssize_t rc;
StringStream stream;
_string_stream_create(&stream, str, 1, 0, sprintf_swrite);
rc = vfprintf((FILE *)(&stream), format, argp);
stream.data[stream.next_write] = 0;
return rc;
}
int
sprintf(char *str, const char *format, ...)
{
va_list argp;
ssize_t rc;
va_start(argp, format);
rc = vsprintf(str, format, argp);
va_end(argp);
return rc;
}
int
vsnprintf(char *str, size_t size, const char *format, va_list argp)
{
ssize_t rc;
StringStream stream;
if (size == 0) {
return 0;
}
_string_stream_create(&stream, str, size, 0, snprintf_swrite);
rc = vfprintf((FILE *)(&stream), format, argp);
stream.data[stream.next_write] = 0;
return rc;
}
int
snprintf(char *str, size_t size, const char *format, ...)
{
va_list argp;
ssize_t rc;
if (size == 0) {
return 0;
}
va_start(argp, format);
rc = vsnprintf(str, size, format, argp);
va_end(argp);
return rc;
}
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