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ggets.c
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ggets.c
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/** ggets.c
*
* Copyright (C) 2020 James D. Lin <[email protected]>
*
* The latest version of this file can be downloaded from:
* <https://github.com/jamesderlin/getline-compatible>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifdef GETLINE_USE_WCHAR
#include "ggetws.h"
#else
#include "ggets.h"
#endif
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "getline.h"
#ifdef GETLINE_USE_WCHAR
typedef wchar_t TCHAR;
#define T(x) L ## x
#define TEOF WEOF
#define FGGETTS_INTERNAL fggetws_internal
#else
typedef char TCHAR;
#define T(x) x
#define TEOF EOF
#define FGGETTS_INTERNAL fggets_internal
#endif
typedef ssize_t (*getline_func)(TCHAR** lineptr, size_t* n, FILE* stream);
/** fggets_internal
*
* Internal wrapper around `getline` or `getline_univ`.
*/
static int
FGGETTS_INTERNAL(TCHAR** line, FILE* stream, getline_func getline)
{
enum { fggets_success, fggets_failure };
int ret = fggets_failure;
TCHAR* buffer = NULL;
size_t bufferSize = 0;
ssize_t elementsRead;
assert(line != NULL);
assert(stream != NULL);
elementsRead = getline(&buffer, &bufferSize, stream);
if (elementsRead < 0)
{
if (feof(stream))
{
ret = TEOF;
}
#ifdef ENOMEM
else if (errno == ENOMEM)
{
/* Transfer ownership of the partially-read line. */
*line = buffer;
buffer = NULL;
}
#endif
else
{
*line = NULL;
}
goto exit;
}
if (elementsRead > 0 && buffer[elementsRead - 1] == T('\n'))
{
elementsRead--;
buffer[elementsRead] = T('\0');
}
/* Shrink the buffer to the minimum size necessary. */
*line = realloc(buffer, (elementsRead + 1 /* NUL */) * sizeof *buffer);
if (*line == NULL)
{
*line = buffer;
}
buffer = NULL;
ret = fggets_success;
exit:
free(buffer);
return ret;
}
#ifndef GETLINE_USE_WCHAR
int
fggets(char** line, FILE* stream)
{
return fggets_internal(line, stream, getline);
}
int
fggets_univ(char** line, FILE* stream)
{
return fggets_internal(line, stream, getline_univ);
}
int
ggets(char** line)
{
return fggets(line, stdin);
}
#endif /* GETLINE_USE_WCHAR */