wmii

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vsmprint.c (2008B)

      1 /*
      2  * The authors of this software are Rob Pike and Ken Thompson.
      3  *              Copyright (c) 2002 by Lucent Technologies.
      4  * Permission to use, copy, modify, and distribute this software for any
      5  * purpose without fee is hereby granted, provided that this entire notice
      6  * is included in all copies of any software which is or includes a copy
      7  * or modification of this software and in all copies of the supporting
      8  * documentation for such software.
      9  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
     10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
     11  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
     12  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
     13  */
     14 /*
     15  * Plan 9 port version must include libc.h in order to
     16  * get Plan 9 debugging malloc, which sometimes returns
     17  * different pointers than the standard malloc.
     18  */
     19 #include <stdlib.h>
     20 #include <string.h>
     21 #include "plan9.h"
     22 #include "fmt.h"
     23 #include "fmtdef.h"
     24 
     25 static int
     26 fmtStrFlush(Fmt *f)
     27 {
     28 	char *s;
     29 	int n;
     30 
     31 	if(f->start == nil)
     32 		return 0;
     33 	n = (uintptr_t)f->farg;
     34 	n *= 2;
     35 	s = (char*)f->start;
     36 	f->start = realloc(s, n);
     37 	if(f->start == nil){
     38 		f->farg = nil;
     39 		f->to = nil;
     40 		f->stop = nil;
     41 		free(s);
     42 		return 0;
     43 	}
     44 	f->farg = (void*)(uintptr_t)n;
     45 	f->to = (char*)f->start + ((char*)f->to - s);
     46 	f->stop = (char*)f->start + n - 1;
     47 	return 1;
     48 }
     49 
     50 int
     51 fmtstrinit(Fmt *f)
     52 {
     53 	int n;
     54 
     55 	memset(f, 0, sizeof *f);
     56 	f->runes = 0;
     57 	n = 32;
     58 	f->start = malloc(n);
     59 	if(f->start == nil)
     60 		return -1;
     61 	f->to = f->start;
     62 	f->stop = (char*)f->start + n - 1;
     63 	f->flush = fmtStrFlush;
     64 	f->farg = (void*)(uintptr_t)n;
     65 	f->nfmt = 0;
     66 	fmtlocaleinit(f, nil, nil, nil);
     67 	return 0;
     68 }
     69 
     70 /*
     71  * print into an allocated string buffer
     72  */
     73 char*
     74 vsmprint(const char *fmt, va_list args)
     75 {
     76 	Fmt f;
     77 	int n;
     78 
     79 	if(fmtstrinit(&f) < 0)
     80 		return nil;
     81 	va_copy(f.args,args);
     82 	n = dofmt(&f, fmt);
     83 	va_end(f.args);
     84 	if(n < 0){
     85 		free(f.start);
     86 		return nil;
     87 	}
     88 	return fmtstrflush(&f);
     89 }