rt-thread-official/components/libc/compilers/common/cstdio.c

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2014-05-22 ivanrad implement getline
*/
#include "posix/stdio.h"
#include <stdlib.h>
#include <limits.h>
#include <sys/errno.h>
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#ifdef DFS_USING_POSIX
ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream)
{
char *cur_pos, *new_lineptr;
size_t new_lineptr_len;
int c;
if (lineptr == NULL || n == NULL || stream == NULL)
{
errno = EINVAL;
return -1;
}
if (*lineptr == NULL)
{
*n = 128; /* init len */
if ((*lineptr = (char *)malloc(*n)) == NULL)
{
errno = ENOMEM;
return -1;
}
}
cur_pos = *lineptr;
for (;;)
{
c = getc(stream);
if (ferror(stream) || (c == EOF && cur_pos == *lineptr))
return -1;
if (c == EOF)
break;
if ((*lineptr + *n - cur_pos) < 2)
{
if (LONG_MAX / 2 < *n)
{
#ifdef EOVERFLOW
errno = EOVERFLOW;
#else
errno = ERANGE; /* no EOVERFLOW defined */
#endif
return -1;
}
new_lineptr_len = *n * 2;
if ((new_lineptr = (char *)realloc(*lineptr, new_lineptr_len)) == NULL)
{
errno = ENOMEM;
return -1;
}
cur_pos = new_lineptr + (cur_pos - *lineptr);
*lineptr = new_lineptr;
*n = new_lineptr_len;
}
*cur_pos++ = (char)c;
if (c == delim)
break;
}
*cur_pos = '\0';
return (ssize_t)(cur_pos - *lineptr);
}
ssize_t getline(char **lineptr, size_t *n, FILE *stream)
{
return getdelim(lineptr, n, '\n', stream);
}
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#endif /* DFS_USING_POSIX */