diff options
Diffstat (limited to 'argp/argp-fmtstream.c')
| -rw-r--r-- | argp/argp-fmtstream.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/argp/argp-fmtstream.c b/argp/argp-fmtstream.c index d563c31b8e..ae547b0acb 100644 --- a/argp/argp-fmtstream.c +++ b/argp/argp-fmtstream.c @@ -1,5 +1,5 @@ /* Word-wrapping and line-truncating streams - Copyright (C) 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. Written by Miles Bader <miles@gnu.ai.mit.edu>. @@ -362,6 +362,7 @@ ssize_t __argp_fmtstream_printf (struct argp_fmtstream *fs, const char *fmt, ...) { int out; + size_t avail; size_t size_guess = PRINTF_SIZE_GUESS; /* How much space to reserve. */ do @@ -370,13 +371,15 @@ __argp_fmtstream_printf (struct argp_fmtstream *fs, const char *fmt, ...) if (! __argp_fmtstream_ensure (fs, size_guess)) return -1; - size_guess += size_guess; va_start (args, fmt); - out = __vsnprintf (fs->p, fs->end - fs->p, fmt, args); + avail = fs->end - fs->p; + out = __vsnprintf (fs->p, avail, fmt, args); va_end (args); + if (out >= avail) + size_guess = out + 1; } - while (out == -1); + while (out >= avail); fs->p += out; |