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29
30 /**
31 * @file datatop_str.c
32 * @brief Algorithms used for storing and polling data created.
33 *
34 * Methods created which store collected data from files in
35 * dictionaries for many different file formats.
36 */
37
38 #include <stdio.h>
39 #include <string.h>
40 #include "datatop_str.h"
41
42 /** @brief Reads an individual line from a file.
43 *
44 * Will read from buf2 until either a '\n' is reached, or the end of buf1
45 * or buf2 is reached. The result is guaranteed to be null terminated.
46 *
47 * @param buf1 Destination buffer to store the read line.
48 * @param len1 Size of destination buffer.
49 * @param buf2 Source buffer to read lines from. Const, will not be
50 * modified by this function.
51 * @param len2 Size of the source buffer.
52 * @param start Offset (in bytes) to start reading from source buffer.
53 * @return Length of line (of chars).
54 */
dt_read_line(char * buf1,int len1,const char * buf2,int len2,int start)55 int dt_read_line(char *buf1, int len1, const char *buf2, int len2, int start)
56 {
57 int i, j;
58
59 if (len1 < 1 || len2 < 1 || start < 0 || start > len2)
60 return 0;
61
62 if (buf1 == 0 || buf2 == 0)
63 return 0;
64
65 i = 0;
66 j = start;
67
68 while ((i < (len1-1)) && (j < len2)) {
69 buf1[i] = buf2[j];
70 if (buf1[i] == '\n')
71 break;
72 i++;
73 j++;
74 }
75 buf1[i] = 0;
76 return i;
77 }
78
79 /**
80 * @brief Parses files that have Names and Values on separate lines.
81 *
82 * Use this method to parse files that have names on one line, followed by
83 * the corresponding values on the next line. Such as "/proc/net/netstat"
84 *
85 * @param line1 First line that is parsed to store the datapoint names as keys.
86 * @param len1 Length of line1.
87 * @param line2 Second line that is parsed to store the datapoint values as dictionary values.
88 * @param len2 Length of line2.
89 * @param dict Dictionary that keys and values are added to.
90 * @return Number of key/val pairs in the dictionary.
91 */
dt_parse_proc_dictionary(char * line1,int len1,char * line2,int len2,struct dt_procdict * dict)92 int dt_parse_proc_dictionary(char *line1, int len1, char *line2,
93 int len2, struct dt_procdict *dict)
94 {
95 int i, j, k;
96
97 if (len1 < 1 || len2 < 1)
98 return 0;
99
100 if (line1 == 0 || line2 == 0 || dict == 0)
101 return 0;
102
103 k = 0;
104 for (i = 0; i < len1 && k < DTOP_DICT_SIZE; i++) {
105 if (line1[i] == ' ') {
106 dict->key[k] = &line1[i+1];
107 line1[i] = 0;
108 k++;
109 }
110 }
111 j = k;
112
113 k = 0;
114 for (i = 0; i < len2 && k < DTOP_DICT_SIZE; i++) {
115 if (line2[i] == ' ') {
116 dict->val[k] = &line2[i+1];
117 line2[i] = 0;
118 k++;
119 }
120 }
121 if (j != k) {
122 if (k < j)
123 j = k;
124 fprintf(stderr, "Warning, list index length mismatch\n");
125 }
126 dict->max = j;
127 return j;
128 }
129
130 /**
131 * @brief Parses line for prefixes for files that have individual data_point prefixes.
132 *
133 * Use this method for lines that have a prefix before data begins. Such as
134 * "/proc/net/snmp"
135 *
136 * @param line1 Line to parse to find datapoint prefix.
137 * @param len1 Length of line1.
138 * @param dict Dictionary prefix is being added to.
139 */
dt_parse_for_prefix(char * line1,int len1,struct dt_procdict * dict)140 void dt_parse_for_prefix(char *line1, int len1, struct dt_procdict *dict)
141 {
142 int i, j, k;
143
144 if (len1 < 1)
145 return;
146
147 if (line1 == 0 || dict == 0)
148 return;
149
150 k = 0;
151 for (i = 0; i < len1 && k < DTOP_DICT_SIZE; i++) {
152 if (line1[i] == ' ') {
153 dict->key[k] = &line1[i+1];
154 line1[i] = 0;
155 k++;
156 }
157 }
158
159 for (j = 0; j < k; j++)
160 dict->val[j] = &line1[0];
161
162 for (j = 0; j < len1; j++) {
163 if (line1[j] == ':')
164 line1[j] = 0;
165 }
166 }
167
168 /**
169 * @brief Finds the dictionary index of a data_point name.
170 *
171 * @param str Name of data_point that is to be located in dict.
172 * @param dict Dictionary to look through for dp name.
173 * @return Dictionary index of name if found.
174 * @return -1 if name not found in dictionary keys.
175 */
dt_find_dict_idx(const char * str,struct dt_procdict * dict)176 int dt_find_dict_idx(const char *str, struct dt_procdict *dict)
177 {
178 int i;
179 if (str == 0 || dict == 0)
180 return -1;
181
182 for (i = 0; i < dict->max; i++) {
183 if (dict->key[i] && !strcmp(str, dict->key[i]))
184 return i;
185 }
186 return -1;
187 }
188
189 /**
190 * @brief Parses files that have Names and Values on same line.
191 *
192 * Use this method to parse lines that have a dp name followed
193 * by a dp value. Such as "/proc/net/snmp6"
194 *
195 * @param line1 Line to parse to find datapoint names and values.
196 * @param len1 Length of line1.
197 * @param l Index in the dictionary the key/val pair is added to.
198 * @param dict Dictionary the keys and values are added to.
199 * @return Number of key/val pairs in the dictionary.
200 */
dt_parse_proc_same_line_key_and_val(char * line1,int len1,int l,struct dt_procdict * dict)201 int dt_parse_proc_same_line_key_and_val(char *line1, int len1,
202 int l, struct dt_procdict *dict)
203 {
204 int i, k, n;
205 if (len1 < 1)
206 return 0;
207
208 if (line1 == 0 || dict == 0)
209 return 0;
210
211 k = l;
212 for (i = 0; i < len1 && k < DTOP_DICT_SIZE; i++) {
213 if (line1[i] == ' ') {
214 dict->key[k] = &line1[0];
215 line1[i] = 0;
216 for (n = i+1; n < len1; n++) {
217 if (line1[n] != ' ') {
218 dict->val[k] = &line1[n+1];
219 break;
220 }
221 }
222 break;
223 }
224 }
225 k++;
226 dict->max = k;
227 return k;
228 }
229
230 /**
231 * @brief Parses files that have a single line.
232 *
233 * Parses a single line file for csv, tab-separated, space-separated, and single
234 * value formats and adds values to a dictionary. Such as
235 * "/proc/sys/net/ipv4/ping_group_range"
236 *
237 * Use this method to parse lines that contain only values.
238 *
239 * @param line1 Line to parse.
240 * @param len1 Length of line1.
241 * @param dict Dictionary datapoints are added to.
242 * @return Number of values dictionary holds.
243 */
dt_single_line_parse(char * line1,int len1,struct dt_procdict * dict)244 int dt_single_line_parse(char *line1, int len1, struct dt_procdict *dict)
245 {
246 int i, k;
247 k = 0;
248 dict->val[k] = &line1[0];
249 k++;
250
251 for (i = 0; i < len1; i++) {
252 if (line1[i] == ' ' || line1[i] == ',' || line1[i] == ' ') {
253 line1[i] = 0;
254 dict->val[k] = &line1[i+1];
255 k++;
256 }
257 }
258 dict->max = k;
259 return k;
260 }
261