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	vsmprint.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	vsmprint.c (1393B)
	---
	1 /* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
	2 /*
	3 * Plan 9 port version must include libc.h in order to
	4 * get Plan 9 debugging malloc, which sometimes returns
	5 * different pointers than the standard malloc.
	6 */
	7 #ifdef PLAN9PORT
	8 #include <u.h>
	9 #include <libc.h>
	10 #include "fmtdef.h"
	11 #else
	12 #include <stdlib.h>
	13 #include <string.h>
	14 #include "plan9.h"
	15 #include "fmt.h"
	16 #include "fmtdef.h"
	17 #endif
	18
	19 static int
	20 fmtStrFlush(Fmt *f)
	21 {
	22 char *s;
	23 int n;
	24
	25 if(f->start == nil)
	26 return 0;
	27 n = (uintptr)f->farg;
	28 n *= 2;
	29 s = (char*)f->start;
	30 f->start = realloc(s, n);
	31 if(f->start == nil){
	32 f->farg = nil;
	33 f->to = nil;
	34 f->stop = nil;
	35 free(s);
	36 return 0;
	37 }
	38 f->farg = (void*)(uintptr)n;
	39 f->to = (char)f->start + ((char)f->to - s);
	40 f->stop = (char*)f->start + n - 1;
	41 return 1;
	42 }
	43
	44 int
	45 fmtstrinit(Fmt *f)
	46 {
	47 int n;
	48
	49 memset(f, 0, sizeof *f);
	50 f->runes = 0;
	51 n = 32;
	52 f->start = malloc(n);
	53 if(f->start == nil)
	54 return -1;
	55 f->to = f->start;
	56 f->stop = (char*)f->start + n - 1;
	57 f->flush = fmtStrFlush;
	58 f->farg = (void*)(uintptr)n;
	59 f->nfmt = 0;
	60 fmtlocaleinit(f, nil, nil, nil);
	61 return 0;
	62 }
	63
	64 /*
	65 * print into an allocated string buffer
	66 */
	67 char*
	68 vsmprint(char *fmt, va_list args)
	69 {
	70 Fmt f;
	71 int n;
	72
	73 if(fmtstrinit(&f) < 0)
	74 return nil;
	75 VA_COPY(f.args,args);
	76 n = dofmt(&f, fmt);
	77 VA_END(f.args);
	78 if(n < 0){
	79 free(f.start);
	80 return nil;
	81 }
	82 return fmtstrflush(&f);
	83 }