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91 lines
2.7 KiB
91 lines
2.7 KiB
/* Formatted output to obstacks. |
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Copyright (C) 2008-2012 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, or (at your option) |
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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 along |
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with this program; if not, see <http://www.gnu.org/licenses/>. */ |
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#include <config.h> |
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/* Specification. */ |
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#include <stdio.h> |
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#include "obstack.h" |
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#include "vasnprintf.h" |
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#include <errno.h> |
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#include <stdarg.h> |
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#include <stdlib.h> |
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/* Grow an obstack with formatted output. Return the number of bytes |
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added to OBS. No trailing nul byte is added, and the object should |
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be closed with obstack_finish before use. |
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Upon memory allocation error, call obstack_alloc_failed_handler. |
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Upon other error, return -1. */ |
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int |
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obstack_printf (struct obstack *obs, const char *format, ...) |
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{ |
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va_list args; |
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int result; |
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va_start (args, format); |
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result = obstack_vprintf (obs, format, args); |
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va_end (args); |
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return result; |
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} |
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/* Grow an obstack with formatted output. Return the number of bytes |
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added to OBS. No trailing nul byte is added, and the object should |
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be closed with obstack_finish before use. |
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Upon memory allocation error, call obstack_alloc_failed_handler. |
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Upon other error, return -1. */ |
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int |
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obstack_vprintf (struct obstack *obs, const char *format, va_list args) |
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{ |
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/* If we are close to the end of the current obstack chunk, use a |
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stack-allocated buffer and copy, to reduce the likelihood of a |
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small-size malloc. Otherwise, print directly into the |
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obstack. */ |
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enum { CUTOFF = 1024 }; |
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char buf[CUTOFF]; |
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char *base = obstack_next_free (obs); |
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size_t len = obstack_room (obs); |
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char *str; |
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if (len < CUTOFF) |
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{ |
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base = buf; |
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len = CUTOFF; |
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} |
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str = vasnprintf (base, &len, format, args); |
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if (!str) |
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{ |
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if (errno == ENOMEM) |
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obstack_alloc_failed_handler (); |
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return -1; |
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} |
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if (str == base && str != buf) |
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/* The output was already computed in place, but we need to |
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account for its size. */ |
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obstack_blank_fast (obs, len); |
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else |
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{ |
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/* The output exceeded available obstack space or we used buf; |
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copy the resulting string. */ |
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obstack_grow (obs, str, len); |
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if (str != buf) |
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free (str); |
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} |
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return len; |
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}
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