1/* //device/system/reference-ril/at_tok.c
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#include "at_tok.h"
19#include <string.h>
20#include <ctype.h>
21#include <stdlib.h>
22
23/**
24 * Starts tokenizing an AT response string
25 * returns -1 if this is not a valid response string, 0 on success.
26 * updates *p_cur with current position
27 */
28int at_tok_start(char **p_cur)
29{
30    if (*p_cur == NULL) {
31        return -1;
32    }
33
34    // skip prefix
35    // consume "^[^:]:"
36
37    *p_cur = strchr(*p_cur, ':');
38
39    if (*p_cur == NULL) {
40        return -1;
41    }
42
43    (*p_cur)++;
44
45    return 0;
46}
47
48static void skipWhiteSpace(char **p_cur)
49{
50    if (*p_cur == NULL) return;
51
52    while (**p_cur != '\0' && isspace(**p_cur)) {
53        (*p_cur)++;
54    }
55}
56
57static void skipNextComma(char **p_cur)
58{
59    if (*p_cur == NULL) return;
60
61    while (**p_cur != '\0' && **p_cur != ',') {
62        (*p_cur)++;
63    }
64
65    if (**p_cur == ',') {
66        (*p_cur)++;
67    }
68}
69
70static char * nextTok(char **p_cur)
71{
72    char *ret = NULL;
73
74    skipWhiteSpace(p_cur);
75
76    if (*p_cur == NULL) {
77        ret = NULL;
78    } else if (**p_cur == '"') {
79        (*p_cur)++;
80        ret = strsep(p_cur, "\"");
81        skipNextComma(p_cur);
82    } else {
83        ret = strsep(p_cur, ",");
84    }
85
86    return ret;
87}
88
89
90/**
91 * Parses the next integer in the AT response line and places it in *p_out
92 * returns 0 on success and -1 on fail
93 * updates *p_cur
94 * "base" is the same as the base param in strtol
95 */
96
97static int at_tok_nextint_base(char **p_cur, int *p_out, int base, int  uns)
98{
99    char *ret;
100
101    if (*p_cur == NULL) {
102        return -1;
103    }
104
105    ret = nextTok(p_cur);
106
107    if (ret == NULL) {
108        return -1;
109    } else {
110        long l;
111        char *end;
112
113        if (uns)
114            l = strtoul(ret, &end, base);
115        else
116            l = strtol(ret, &end, base);
117
118        *p_out = (int)l;
119
120        if (end == ret) {
121            return -1;
122        }
123    }
124
125    return 0;
126}
127
128/**
129 * Parses the next base 10 integer in the AT response line
130 * and places it in *p_out
131 * returns 0 on success and -1 on fail
132 * updates *p_cur
133 */
134int at_tok_nextint(char **p_cur, int *p_out)
135{
136    return at_tok_nextint_base(p_cur, p_out, 10, 0);
137}
138
139/**
140 * Parses the next base 16 integer in the AT response line
141 * and places it in *p_out
142 * returns 0 on success and -1 on fail
143 * updates *p_cur
144 */
145int at_tok_nexthexint(char **p_cur, int *p_out)
146{
147    return at_tok_nextint_base(p_cur, p_out, 16, 1);
148}
149
150int at_tok_nextbool(char **p_cur, char *p_out)
151{
152    int ret;
153    int result;
154
155    ret = at_tok_nextint(p_cur, &result);
156
157    if (ret < 0) {
158        return -1;
159    }
160
161    // booleans should be 0 or 1
162    if (!(result == 0 || result == 1)) {
163        return -1;
164    }
165
166    if (p_out != NULL) {
167        *p_out = (char)result;
168    }
169
170    return ret;
171}
172
173int at_tok_nextstr(char **p_cur, char **p_out)
174{
175    if (*p_cur == NULL) {
176        return -1;
177    }
178
179    *p_out = nextTok(p_cur);
180
181    return 0;
182}
183
184/** returns 1 on "has more tokens" and 0 if no */
185int at_tok_hasmore(char **p_cur)
186{
187    return ! (*p_cur == NULL || **p_cur == '\0');
188}
189
190
191