fgets.c

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#include <stdio.h>
 
#include "user/common/file.h"
 
char* fgets(char* _RESTRICT s, int size, FILE* _RESTRICT stream)
{
    char* dest = s;
 
    if (size == 0)
    {
        return NULL;
    }
 
    if (size == 1)
    {
        *s = '\0';
        return s;
    }
 
    mtx_lock(&stream->mtx);
 
    if (_file_prepare_read(stream) != ERR)
    {
        do
        {
            if (_FILE_CHECK_AVAIL(stream) == ERR)
            {
                /* In case of error / EOF before a character is read, this
                   will lead to a \0 be written anyway. Since the results
                   are "indeterminate" by definition, this does not hurt.
                */
                break;
            }
        } while (((*dest++ = _FILE_GETC(stream)) != '\n') && (--size > 0));
    }
 
    mtx_unlock(&stream->mtx);
 
    *dest = '\0';
    return (dest == s) ? NULL : s;
}