86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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#include "fmtdef.h"
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static int
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fmtStrFlush(Fmt *f)
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{
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char *s;
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int n;
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if(f->start == nil)
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return 0;
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n = (int)(uintptr)f->farg;
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n *= 2;
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s = f->start;
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f->start = realloc(s, n);
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if(f->start == nil){
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f->farg = nil;
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f->to = nil;
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f->stop = nil;
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free(s);
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return 0;
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}
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f->farg = (void*)(uintptr_t)n;
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f->to = (char*)f->start + ((char*)f->to - s);
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f->stop = (char*)f->start + n - 1;
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return 1;
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}
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int
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fmtstrinit(Fmt *f)
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{
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int n;
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memset(f, 0, sizeof *f);
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f->runes = 0;
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n = 32;
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/* this should not be necessary */
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n = 4096;
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f->start = malloc(n);
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if(f->start == nil)
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return -1;
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setmalloctag(f->start, getcallerpc());
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f->to = f->start;
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f->stop = (char*)f->start + n - 1;
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f->flush = fmtStrFlush;
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f->farg = (void*)(uintptr_t)n;
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f->nfmt = 0;
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return 0;
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}
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/*
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* print into an allocated string buffer
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*/
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char*
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vsmprint(const char *fmt, va_list args)
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{
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Fmt f;
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int n;
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if(fmtstrinit(&f) < 0)
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return nil;
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//f.args = args;
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va_copy(f.args,args);
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n = dofmt(&f, fmt);
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va_end(f.args);
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if(f.start == nil) /* realloc failed? */
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return nil;
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if(n < 0){
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free(f.start);
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return nil;
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}
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setmalloctag(f.start, getcallerpc());
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*(char*)f.to = '\0';
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return f.start;
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}
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