summaryrefslogtreecommitdiff
path: root/pith/list.c
blob: a2773d643c1c91bc3a9dfc8f54cd64fe353828dc (plain)
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: list.c 769 2007-10-24 00:15:40Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2007 University of Washington
 * Copyright 2013-2018 Eduardo Chappa
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */

/*======================================================================
     list.c
  ====*/


#include "../pith/headers.h"
#include "../pith/list.h"
#include "../pith/string.h"


/*
 * Internal prototypes
 */


/*
 * parse_list - takes a comma delimited list of "count" elements and 
 *              returns an array of pointers to each element neatly
 *              malloc'd in its own array.  Any errors are returned
 *              in the string pointed to by "error"
 *
 *	If remove_surrounding_double_quotes is set, then double quotes around
 *	each element of the list are removed. We can't do this for all list
 *	variables. For example, incoming folders look like
 *		nickname foldername
 *	in the config file. Each of those may be quoted separately.
 *
 *  NOTE: only recognizes escaped quotes
 */
char **
parse_list(char *list, int count, int flags, char **error)
{
    char **lvalue, *p2, *p3, *p4;
    int    was_quoted = 0;
    int    remove_surrounding_double_quotes;
    int    commas_may_be_escaped;

    remove_surrounding_double_quotes = (flags & PL_REMSURRQUOT);
    commas_may_be_escaped = (flags & PL_COMMAQUOTE);

    lvalue = (char **) fs_get((count+1) * sizeof(char *));
    count  = 0;
    while(*list){			/* pick elements from list */
	p2 = list;		/* find end of element */
	while(1){
	    if(*p2 == '"')	/* ignore ',' if quoted   */
	      was_quoted = (was_quoted) ? 0 : 1 ;

	    if(*p2 == '\\' && *(p2+1) == '"')
	      p2++;		/* preserve escaped quotes, too */

	    if((*p2 == ',' && !was_quoted) || *p2 == '\0')
	      break;

	    if(commas_may_be_escaped && *p2 == '\\' && *(p2+1) == ',')
	      p2++;

	    p2++;
	}

	if(was_quoted){		/* unbalanced quotes! */
	    if(error)
	      *error = "Unbalanced quotes";

	    break;
	}

	/*
	 * if element found, eliminate trailing 
	 * white space and tie into variable list
	 */
	if(p2 != list){
	    for(p3 = p2 - 1; isspace((unsigned char) *p3) && list < p3; p3--)
	      ;

	    p4 = fs_get(((p3 - list) + 2) * sizeof(char));
	    lvalue[count] = p4;
	    while(list <= p3)
	      *p4++ = *list++;

	    *p4 = '\0';

	    if(remove_surrounding_double_quotes)
	      removing_double_quotes(lvalue[count]);
	    
	    count++;
	}

	if(*(list = p2) != '\0'){	/* move to beginning of next val */
	    while(*list == ',' || isspace((unsigned char)*list))
	      list++;
	}
    }

    lvalue[count] = NULL;		/* tie off pointer list */
    return(lvalue);
}


/*
 * Free array of string pointers and associated strings
 *
 * Args: list -- array of char *'s
 */
void
free_list_array(char ***list)
{
    char **p;

    if(list && *list){
	for(p = *list; *p; p++)
	  fs_give((void **) p);

	fs_give((void **) list);
    }
}


/*
 * Copy array of string pointers and associated strings
 *
 * Args: list -- array of char *'s
 *
 * Returns: Allocated array of string pointers and allocated copies of strings.
 *          Caller should free the list array when done.
 */
char **
copy_list_array(char **list)
{
    int    i, cnt = 0;
    char **p, **ret_list = NULL;

    if(list){
	while(list[cnt++])
	  ;

	p = ret_list = (char **)fs_get((cnt+1) * sizeof(char *));
	memset((void *) ret_list, 0, (cnt+1) * sizeof(char *));

	for(i=0; list[i]; i++, p++)
	  *p = cpystr(list[i]);
	
	*p = NULL;

    }

    return(ret_list);
}


int
equal_list_arrays(char **list1, char **list2)
{
    int ret = 0;

    if(list1 && list2){
	while(*list1){
	    if(!*list2 || strcmp(*list1, *list2) != 0)
	      break;
	    
	    list1++;
	    list2++;
	}

	if(*list1 == NULL && *list2 == NULL)
	  ret++;
    }

    return(ret);
}