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87 lines
1.8 KiB
87 lines
1.8 KiB
/*
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* UCW Library -- Printf on Fastbuf Streams
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*
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* (c) 2002--2013 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/fastbuf.h>
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#include <ucw/resource.h>
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#include <stdio.h>
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#include <alloca.h>
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int
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vbprintf(struct fastbuf *b, const char *msg, va_list args)
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{
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byte *buf;
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int remains, len;
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va_list args2;
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va_copy(args2, args);
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remains = bdirect_write_prepare(b, &buf);
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len = vsnprintf(buf, remains, msg, args2);
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va_end(args2);
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if (len < remains)
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{
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bdirect_write_commit(b, buf + len);
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return len;
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}
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/*
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* We need a temporary buffer. If it is small, let's use stack.
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* Otherwise, we malloc it, but we have to be careful, since we
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* might be running inside a transaction and bwrite() could
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* throw an exception.
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*
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* FIXME: This deserves a more systematic solution, the same
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* problem is likely to happen at other places, too.
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*/
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int bufsize = len + 1;
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struct resource *res = NULL;
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byte *extra_buffer = NULL;
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if (bufsize <= 256)
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buf = alloca(bufsize);
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else if (rp_current())
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buf = res_malloc(bufsize, &res);
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else
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buf = extra_buffer = xmalloc(bufsize);
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vsnprintf(buf, bufsize, msg, args);
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bwrite(b, buf, len);
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if (res)
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res_free(res);
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else if (extra_buffer)
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xfree(extra_buffer);
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return len;
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}
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int
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bprintf(struct fastbuf *b, const char *msg, ...)
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{
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va_list args;
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int res;
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va_start(args, msg);
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res = vbprintf(b, msg, args);
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va_end(args);
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return res;
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}
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#ifdef TEST
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int main(void)
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{
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struct fastbuf *b = bfdopen_shared(1, 65536);
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for (int i=0; i<10000; i++)
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bprintf(b, "13=%d str=<%s> msg=%m\n", 13, "str");
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bclose(b);
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return 0;
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}
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#endif
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