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- /*
- * The authors of this software are Rob Pike and Ken Thompson.
- * Copyright (c) 2002 by Lucent Technologies.
- * Permission to use, copy, modify, and distribute this software for any
- * purpose without fee is hereby granted, provided that this entire notice
- * is included in all copies of any software which is or includes a copy
- * or modification of this software and in all copies of the supporting
- * documentation for such software.
- * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
- * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
- * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
- */
- #include "lib9.h"
- #include "fmtdef.h"
- static int
- fmtStrFlush(Fmt *f)
- {
- char *s;
- int n;
- if(f->start == nil)
- return 0;
- n = (int)f->farg;
- n += 256;
- f->farg = (void*)n;
- s = f->start;
- f->start = realloc(s, n);
- if(f->start == nil){
- free(s);
- f->to = nil;
- f->stop = nil;
- return 0;
- }
- f->to = (char*)f->start + ((char*)f->to - s);
- f->stop = (char*)f->start + n - 1;
- return 1;
- }
- int
- fmtstrinit(Fmt *f)
- {
- int n;
- memset(f, 0, sizeof(*f));
- n = 32;
- f->start = malloc(n);
- if(f->start == nil)
- return -1;
- f->to = f->start;
- f->stop = (char*)f->start + n - 1;
- f->flush = fmtStrFlush;
- f->farg = (void*)n;
- f->nfmt = 0;
- return 0;
- }
- /*
- * print into an allocated string buffer
- */
- char*
- vsmprint(char *fmt, va_list args)
- {
- Fmt f;
- int n;
- if(fmtstrinit(&f) < 0)
- return nil;
- va_copy(f.args, args);
- n = dofmt(&f, fmt);
- va_end(f.args);
- if(n < 0){
- free(f.start);
- f.start = nil;
- return nil;
- }
- return fmtstrflush(&f);
- }
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