78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
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/* Formatted output to a stream.
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Copyright (C) 2004, 2006-2018 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include "fseterr.h"
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#include "vasnprintf.h"
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/* Print formatted output to the stream FP.
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Return string length of formatted string. On error, return a negative
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value. */
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int
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fprintf (FILE *fp, const char *format, ...)
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{
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char buf[2000];
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char *output;
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size_t len;
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size_t lenbuf = sizeof (buf);
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va_list args;
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va_start (args, format);
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output = vasnprintf (buf, &lenbuf, format, args);
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len = lenbuf;
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va_end (args);
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if (!output)
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{
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fseterr (fp);
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return -1;
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}
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if (fwrite (output, 1, len, fp) < len)
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{
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if (output != buf)
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{
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int saved_errno = errno;
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free (output);
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errno = saved_errno;
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}
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return -1;
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}
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if (output != buf)
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free (output);
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if (len > INT_MAX)
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{
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errno = EOVERFLOW;
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fseterr (fp);
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return -1;
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}
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return len;
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}
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