libcutils

libcutils/src/dyn_string.c
dyn_string.c
⎇
Raw
1#include <cutils/dyn_string.h>
2
3String* string_with_capacity(size_t capacity)
4{
5 String* string = malloc(sizeof(*string));
6 if(!string)
7 return NULL;
8 string->chars = calloc(capacity,sizeof(*string->chars));
9 if(!string->chars)
10 {
11 free(string);
12 return NULL;
13 }
14 string->length = 0;
15 string->capacity = capacity;
16
17 return string;
18}
19
20void string_remove(String* string, size_t index)
21{
22 if(index < string->length)
23 {
24 memmove(string->chars+index, string->chars+index+1, (string->length-index-1)*sizeof(*string->chars));
25 --string->length;
26 }
27}
28
29void string_remove_range(String* string, size_t index, size_t length)
30{
31 size_t i;
32 for(i = 0; i < length; i++)
33 {
34 string_remove(string, index+i);
35 }
36}
37
38bool_t string_insert(String* string, size_t index, char character)
39{
40 if(index > string->length || !string_adjust_size(string, string->length))
41 return b_false;
42
43 memmove(string->chars+index+1, string->chars+index, (string->length-index)*sizeof(*string->chars));
44 string->chars[index] = character;
45 string->length++;
46 return b_true;
47}
48
49char string_at(const String* string, size_t index)
50{
51 if(index >= string->length)
52 return '\0';
53 else
54 return string->chars[index];
55}
56
57char string_pop_at(String* string, size_t index)
58{
59 char tmp = string_at(string, index);
60 if(!tmp)
61 {
62 return '\0';
63 } else {
64 string_remove(string, index);
65 return tmp;
66 }
67}
68
69bool_t string_concat(String* string, const String* other)
70{
71 if(!string_adjust_size(string,string->length+other->length-1))
72 return b_false;
73 memcpy(string->chars+string->length,other->chars,other->length);
74 string->length += other->length;
75 return b_true;
76}
77
78size_t* string_find_char(const String* haystack, const char needle)
79{
80 size_t* ret;
81 size_t i;
82 for(i = 0; i < haystack->length; i++)
83 {
84 if(haystack->chars[i] == needle)
85 {
86 ret = malloc(sizeof(*ret));
87 *ret = i;
88 return ret;
89 }
90 }
91 return NULL;
92}
93
94bool_t string_adjust_size(String* string, size_t size)
95{
96 while(string->capacity < size)
97 {
98 char* tmp = string->chars;
99 string->chars = realloc(string->chars, string->capacity*2*(sizeof(*string->chars)));
100 if(!string->chars)
101 {
102 string->chars = tmp;
103 return b_false;
104 }
105 string->capacity *= 2;
106 }
107 return b_true;
108}
109
110
111void delete_string(String* string)
112{
113 free(string->chars);
114 free(string);
115}
116
117String* from_cstring(const char* cstring)
118{
119 String* string = string_with_capacity(strlen(cstring));
120 if(!string)
121 {
122 return NULL;
123 } else {
124 memcpy(string->chars, cstring, strlen(cstring));
125 string->length = strlen(cstring);
126 return string;
127 }
128
129}
130
131String* from_cstring_del(char* cstring)
132{
133 String* ret = from_cstring(cstring);
134 free(cstring);
135 return ret;
136}
137
138char* to_cstring(const String* string)
139{
140 char* cstring = malloc(string->length+1);
141 memcpy(cstring, string->chars, string->length);
142 cstring[string->length] = '\0';
143
144 return cstring;
145}
146
147char* to_cstring_del(String* string)
148{
149 char* ret = to_cstring(string);
150 delete_string(string);
151 return ret;
152}
153