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	quote.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	quote.c (2271B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3
	4
	5 /* in libfmt */
	6 extern int (*doquote)(int);
	7 extern int __needsquotes(char, int);
	8 extern int __runeneedsquotes(Rune, int);
	9
	10 char*
	11 unquotestrdup(char *s)
	12 {
	13 char t, ret;
	14 int quoting;
	15
	16 ret = s = strdup(s); /* return unquoted copy */
	17 if(ret == nil)
	18 return ret;
	19 quoting = 0;
	20 t = s; /* s is output string, t is input string */
	21 while(t!='\0' && (quoting \|\| (t!=' ' && *t!='\t'))){
	22 if(*t != '\''){
	23 s++ = t++;
	24 continue;
	25 }
	26 /* t is a quote /
	27 if(!quoting){
	28 quoting = 1;
	29 t++;
	30 continue;
	31 }
	32 /* quoting and we're on a quote */
	33 if(t[1] != '\''){
	34 /* end of quoted section; absorb closing quote */
	35 t++;
	36 quoting = 0;
	37 continue;
	38 }
	39 /* doubled quote; fold one quote into two */
	40 t++;
	41 s++ = t++;
	42 }
	43 if(t != s)
	44 memmove(s, t, strlen(t)+1);
	45 return ret;
	46 }
	47
	48 Rune*
	49 unquoterunestrdup(Rune *s)
	50 {
	51 Rune t, ret;
	52 int quoting;
	53
	54 ret = s = runestrdup(s); /* return unquoted copy */
	55 if(ret == nil)
	56 return ret;
	57 quoting = 0;
	58 t = s; /* s is output string, t is input string */
	59 while(t!='\0' && (quoting \|\| (t!=' ' && *t!='\t'))){
	60 if(*t != '\''){
	61 s++ = t++;
	62 continue;
	63 }
	64 /* t is a quote /
	65 if(!quoting){
	66 quoting = 1;
	67 t++;
	68 continue;
	69 }
	70 /* quoting and we're on a quote */
	71 if(t[1] != '\''){
	72 /* end of quoted section; absorb closing quote */
	73 t++;
	74 quoting = 0;
	75 continue;
	76 }
	77 /* doubled quote; fold one quote into two */
	78 t++;
	79 s++ = t++;
	80 }
	81 if(t != s)
	82 memmove(s, t, (runestrlen(t)+1)*sizeof(Rune));
	83 return ret;
	84 }
	85
	86 char*
	87 quotestrdup(char *s)
	88 {
	89 char t, u, *ret;
	90 int quotelen;
	91 Rune r;
	92
	93 if(__needsquotes(s, &quotelen) == 0)
	94 return strdup(s);
	95
	96 ret = malloc(quotelen+1);
	97 if(ret == nil)
	98 return nil;
	99 u = ret;
	100 *u++ = '\'';
	101 for(t=s; *t; t++){
	102 r = *t;
	103 if(r == '\'')
	104 u++ = r; / double the quote */
	105 *u++ = r;
	106 }
	107 *u++ = '\'';
	108 *u = '\0';
	109 return ret;
	110 }
	111
	112 Rune*
	113 quoterunestrdup(Rune *s)
	114 {
	115 Rune t, u, *ret;
	116 int quotelen;
	117 Rune r;
	118
	119 if(__runeneedsquotes(s, &quotelen) == 0)
	120 return runestrdup(s);
	121
	122 ret = malloc((quotelen+1)*sizeof(Rune));
	123 if(ret == nil)
	124 return nil;
	125 u = ret;
	126 *u++ = '\'';
	127 for(t=s; *t; t++){
	128 r = *t;
	129 if(r == '\'')
	130 u++ = r; / double the quote */
	131 *u++ = r;
	132 }
	133 *u++ = '\'';
	134 *u = '\0';
	135 return ret;
	136 }