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/** @file
A brief file description
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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.
*/
/*****************************************************************************
ink_sprintf.cc
This file implements some Inktomi variants of sprintf, to do bounds
checking and length counting.
****************************************************************************/
#include "ts/ink_sprintf.h"
#define NUL '\0'
//////////////////////////////////////////////////////////////////////////////
//
// int ink_bsprintf(char *buffer, char *format, ...)
// int ink_bvsprintf(char *buffer, char *format, va_list ap)
//
// This is a very simplified version of sprintf that has the following
// behavior:
//
// (1) the length in output characters is returned, including final NUL
// (2) buffer can be NULL, for just counting the output chars
// (3) only %s and %d are supported, with no field modifiers
//
//////////////////////////////////////////////////////////////////////////////
int
ink_bsprintf(char *buffer, const char *format, ...)
{
int l;
va_list ap;
va_start(ap, format);
l = ink_bvsprintf(buffer, format, ap);
va_end(ap);
return (l);
}
int
ink_bvsprintf(char *buffer, const char *format, va_list ap)
{
int d_val;
const char *s;
char *d, *p, *s_val, d_buffer[32];
va_list ap_local;
va_copy(ap_local, ap);
s = format;
d = buffer;
while (*s) {
/////////////////////////////
// handle non-% characters //
/////////////////////////////
if (buffer) // if have output buffer
while (*s && (*s != '%')) {
*d++ = *s++;
} // really copy, else
else
while (*s && (*s != '%')) {
d++;
s++;
} // pass over string
///////////////////////////
// handle NUL characters //
///////////////////////////
if (*s == NUL)
break; // end of string
/////////////////////////
// handle % characters //
/////////////////////////
++s; // consume % character
switch (*s) // dispatch on flag
{
case 's': // %s pattern
++s; // consume 's'
s_val = va_arg(ap_local, char *); // grab string argument
p = s_val; // temporary pointer
if (buffer) // if have output buffer
while (*p) {
*d++ = *p++;
} // copy value
else // else
while (*p) {
d++;
p++;
} // pass over value
break;
case 'd': // %d pattern
++s; // consume 'd'
d_val = va_arg(ap_local, int); // grab integer argument
snprintf(d_buffer, sizeof(d_buffer), "%d", d_val); // stringify integer
p = d_buffer; // temporary pointer
if (buffer) // if have output buffer
while (*p) {
*d++ = *p++;
} // copy value
else // else
while (*p) {
d++;
p++;
} // pass over value
break;
default: // something else
if (buffer)
*d = *s; // copy unknown character
++d;
++s;
break;
}
}
if (buffer)
*d = NUL;
++d;
va_end(ap_local);
return (int)(d - buffer);
}
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