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	encodefmt.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	encodefmt.c (1072B)
	---
	1 #include <lib9.h>
	2
	3 int
	4 encodefmt(Fmt *f)
	5 {
	6 char *out;
	7 char buf, p;
	8 int len;
	9 int ilen;
	10 int rv;
	11 uchar *b;
	12 char obuf[64]; /* rsc optimization */
	13
	14 b = va_arg(f->args, uchar*);
	15 if(b == 0)
	16 return fmtstrcpy(f, "<nil>");
	17
	18 ilen = f->prec;
	19 f->prec = 0;
	20
	21 if(!(f->flags&FmtPrec) \|\| ilen < 0)
	22 goto error;
	23
	24 f->flags &= ~FmtPrec;
	25
	26 switch(f->r){
	27 case '<':
	28 len = (8*ilen+4)/5 + 3;
	29 break;
	30 case '[':
	31 len = (8*ilen+5)/6 + 4;
	32 break;
	33 case 'H':
	34 len = 2*ilen + 1;
	35 break;
	36 default:
	37 goto error;
	38 }
	39
	40 if(len > sizeof(obuf)){
	41 buf = malloc(len);
	42 if(buf == nil)
	43 goto error;
	44 } else
	45 buf = obuf;
	46
	47 /* convert */
	48 out = buf;
	49 switch(f->r){
	50 case '<':
	51 rv = enc32(out, len, b, ilen);
	52 break;
	53 case '[':
	54 rv = enc64(out, len, b, ilen);
	55 break;
	56 case 'H':
	57 rv = enc16(out, len, b, ilen);
	58 if(rv >= 0 && (f->flags & FmtLong))
	59 for(p = buf; *p; p++)
	60 p = tolower((uchar)p);
	61 break;
	62 default:
	63 rv = -1;
	64 break;
	65 }
	66 if(rv < 0)
	67 goto error;
	68
	69 fmtstrcpy(f, buf);
	70 if(buf != obuf)
	71 free(buf);
	72 return 0;
	73
	74 error:
	75 return fmtstrcpy(f, "<encodefmt>");
	76 }