/usr/share/doc/libowfs-dev/examples/owcapi/C/owcapiexample.c is in libow-dev 2.9p8-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | #include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <string.h>
#include <owcapi.h>
const char DEFAULT_ARGV[] = "--fake 28 --fake 10";
const char DEFAULT_PATH[] = "/";
/* Takes a path and filename and prints the 1-wire value */
/* makes sure the bridging "/" in the path is correct */
/* watches for total length and free allocated space */
void GetValue(const char *path, const char *name)
{
char fullpath[PATH_MAX + 1];
int length_left = PATH_MAX;
char *get_buffer;
ssize_t get_return;
size_t get_length;
/* Check arguments and lengths */
if (path == NULL || strlen(path) == 0) {
path = "/";
}
if (name == NULL) {
name = "";
}
fullpath[PATH_MAX] = '\0'; // make sure final 0 byte
strncpy(fullpath, path, length_left);
length_left -= strlen(fullpath);
if (length_left > 0) {
if (fullpath[PATH_MAX - length_left - 1] != '/') {
strcat(fullpath, "/");
--length_left;
}
}
if (name[0] == '/') {
++name;
}
strncpy(&fullpath[PATH_MAX - length_left], name, length_left);
get_return = OW_get(fullpath, &get_buffer, &get_length);
if (get_return < 0) {
printf("ERROR (%d) reading %s (%s)\n", errno, fullpath, strerror(errno));
} else {
printf("%s has value %s (%d bytes)\n", fullpath, get_buffer, (int) get_length);
free(get_buffer);
}
}
int main(int argc, char **argv)
{
const char *path = DEFAULT_PATH;
ssize_t dir_return;
char *dir_buffer = NULL;
char *dir_buffer_copy = NULL;
size_t dir_length;
char **d_buffer;
char *dir_member;
/* ------------- INITIALIZATIOB ------------------ */
/* steal first argument and treat it as a path (if not beginning with '-') */
if ((argc > 1) && (argv[1][0] != '-')) {
path = argv[1];
argv = &argv[1];
argc--;
}
if (argc < 2) {
printf("Starting with extra parameter \"%s\" as default\n", DEFAULT_ARGV);
if (OW_init(DEFAULT_ARGV) < 0) {
printf("OW_init error = %d (%s)\n", errno, strerror(errno));
goto cleanup;
}
} else {
if (OW_init_args(argc, argv) < 0) {
printf("OW_init error = %d (%s)\n", errno, strerror(errno));
goto cleanup;
}
}
/* ------------- DIRECTORY PATH ------------------ */
dir_return = OW_get(path, &dir_buffer, &dir_length);
if (dir_return < 0) {
printf("DIRECTORY ERROR (%d) reading %s (%s)\n", errno, path, strerror(errno));
goto cleanup;
} else {
printf("Directory %s has members %s (%d bytes)\n", path, dir_buffer, (int) dir_length);
}
printf("\n");
/* ------------- GO THROUGH DIR ------------------ */
d_buffer = &dir_buffer;
dir_buffer_copy = dir_buffer;
while ((dir_member = strsep(d_buffer, ",")) != NULL) {
switch (dir_member[0]) {
case '1':
if (dir_member[1] == '0') {
// DS18S20 (family code 10)
GetValue(dir_member, "temperature");
}
//fall through
case '0':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
{
GetValue(dir_member, "type");
}
break;
default:
break;
}
}
/* ------------- STATIC PATHS ------------------ */
GetValue("system/process", "pid");
GetValue("badPath", "badName");
cleanup:
/* ------------- DONE -- CLEANUP ----------------- */
OW_finish();
if (dir_buffer_copy) {
free(dir_buffer_copy);
dir_buffer_copy = NULL;
}
return 0;
}
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