/[soft]/ldetect/trunk/common.c
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Contents of /ldetect/trunk/common.c

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Revision 1357 - (show annotations) (download)
Tue May 17 09:21:22 2011 UTC (10 years, 1 month ago) by dmorgan
File MIME type: text/plain
File size: 3380 byte(s)
Import  ldetect
1
2 #define _GNU_SOURCE
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6 #include <unistd.h>
7 #include <sys/types.h>
8 #include <sys/wait.h>
9 #include "common.h"
10
11 char *table_name_to_file(const char *name) {
12
13 char *share_path = getenv("SHARE_PATH");
14 char *fname;
15 if (!share_path || !*share_path) share_path = "/usr/share";
16
17 asprintf(&fname, "%s/ldetect-lst/%s", share_path, name);
18
19 return fname;
20 }
21
22 fh fh_open(const char *name) {
23 fh ret;
24 char *fname = table_name_to_file(name);
25
26 if (access(fname, R_OK) == 0) {
27 /* prefer gzip type when not compressed, more direct than zlib access */
28 ret.gztype = GZIP;
29 ret.u.gzip_fh.f = fopen(fname, "r");
30 ret.u.gzip_fh.pid = 0;
31 } else {
32 char *fname_gz;
33 asprintf(&fname_gz, "%s.gz", fname);
34 if (access(GZIP_BIN, R_OK) == 0) {
35 int fdno[2];
36 ret.gztype = GZIP;
37 if (access(fname_gz, R_OK) != 0) {
38 fprintf(stderr, "Missing %s (should be %s)\n", name, fname);
39 exit(1);
40 }
41 if (pipe(fdno)) {
42 perror("pciusb");
43 exit(1);
44 }
45
46 if ((ret.u.gzip_fh.pid = fork()) != 0) {
47 ret.u.gzip_fh.f = fdopen(fdno[0], "r");
48 close(fdno[1]);
49 } else {
50 char* cmd[5];
51 int ip = 0;
52 char *ld_loader = getenv("LD_LOADER");
53
54 if (ld_loader && *ld_loader)
55 cmd[ip++] = ld_loader;
56
57 cmd[ip++] = GZIP_BIN;
58 cmd[ip++] = "-cd";
59 cmd[ip++] = fname_gz;
60 cmd[ip++] = NULL;
61
62 dup2(fdno[1], STDOUT_FILENO);
63 close(fdno[0]);
64 close(fdno[1]);
65 execvp(cmd[0], cmd);
66 perror("pciusb");
67 exit(2);
68 }
69 } else {
70 ret.gztype = ZLIB;
71 ret.u.zlib_fh = gzopen(fname_gz, "r");
72 if (!ret.u.zlib_fh) {
73 perror("pciusb");
74 exit(3);
75 }
76 }
77 free(fname_gz);
78 }
79
80 free(fname);
81 return ret;
82 }
83
84 char* fh_gets(char *line, int size, fh *f) {
85 char *ret = NULL;
86 switch (f->gztype) {
87 case ZLIB:
88 ret = gzgets(f->u.zlib_fh, line, size);
89 break;
90 case GZIP:
91 ret = fgets(line, size, f->u.gzip_fh.f);
92 break;
93 }
94 return ret;
95 }
96
97 int fh_close(fh *f) {
98 int ret = EOF;
99 switch (f->gztype) {
100 case ZLIB:
101 ret = gzclose(f->u.zlib_fh);
102 break;
103 case GZIP:
104 ret = fclose(f->u.gzip_fh.f);
105 if (f->u.gzip_fh.pid > 0)
106 waitpid(f->u.gzip_fh.pid, NULL, 0);
107 break;
108 }
109 return ret;
110 }

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