在环境变量中查找一个元素，如果存在的话，将它的值分别打印出来

时间：2011-03-09 来源：陶器

1 /*
2  * Look up a given string in the environment variable,
3  * print out its values respectively if present.
4  *
5  * [email protected]
6  */
7
8 #include <stdlib.h>
9 #include <string.h>
10 #include <stdio.h>
11
12 #include <iostream>
13
14 using namespace std;
15
16 #define ENV_MAX_CHAR    0x0400
17
18 int
19 main(int argc,
20     char *argv[],
21     char **env)
22 {
23     int cnt = 0;
24
25     if (argc < 2) {
26         cout << "Usage: a.out <string> " << endl;
27         return EXIT_FAILURE;
28     }
29
30     for (cnt = 0; env[cnt] != NULL; cnt++) {
31         if (0 == strnicmp(env[cnt], argv[1], 4)) {
32             char *p = (char *)malloc(ENV_MAX_CHAR * sizeof(char));
33             char *pch = NULL;
34
35             strcpy(p, env[cnt]);
36             cout << "#Splitting string: " << endl;
37             cout << "\"" << p << "\"" << endl;
38             cout << "#into tokens:\n" << endl;
39
40             pch = strtok(p, "=;");
41             while(pch != NULL) {
42                 cout << pch << endl;
43                 pch = strtok(NULL, "=;");
44             }
45
46             free(p);
47             break;
48         }
49     }
50     if (env[cnt] == NULL)
51         cout << "Nothing match.";
52
53     return EXIT_SUCCESS;
54 }