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