1 files changed, 128 insertions, 0 deletions
diff --git a/demo/utils.c b/demo/utils.c
new file mode 100644
index 0000000..30780c4
--- /dev/null
+++ b/demo/utils.c
@@ -0,0 +1,128 @@
+#include <time.h>
+#include <stdio.h> 
+#include <stdlib.h> 
+#include <unistd.h> 
+#include <errno.h> 
+#include <semaphore.h>
+#include <string.h>
+
+
+#include <sys/ipc.h>		/* for system's IPC_xxx definitions */
+#include <sys/shm.h>		/* for shmget, shmat, shmdt, shmctl */
+#include <sys/sem.h>		/* for semget, semctl, semop */
+
+#include "utils.h"
+#include "md5.h"
+
+
+void md5ify(char *inString, char *outString) {
+	md5_state_t state;
+	md5_byte_t digest[16];
+    int i;
+    
+	md5_init(&state);
+	md5_append(&state, (const md5_byte_t *)inString, strlen(inString));
+	md5_finish(&state, digest);
+
+    for (i = 0; i < 16; i++)
+        sprintf(&outString[i * 2], "%02x", digest[i]);
+}
+
+void say(const char *pName, char *pMessage) {
+    time_t the_time;
+    struct tm *the_localtime;
+    char timestamp[256];
+    
+    the_time = time(NULL);
+    
+    the_localtime = localtime(&the_time);
+    
+    strftime(timestamp, 255, "%H:%M:%S", the_localtime);
+    
+    printf("%s @ %s: %s\n", pName, timestamp, pMessage);
+    
+}
+
+
+int release_semaphore(const char *pName, int sem_id, int live_dangerously) {
+    int rc = 0;
+    struct sembuf op[1];
+    char s[1024];
+    
+    say(pName, "Releasing the semaphore.");
+    
+    if (!live_dangerously) {
+        op[0].sem_num = 0;
+        op[0].sem_op = 1;
+        op[0].sem_flg = 0;
+
+        if (-1 == semop(sem_id, op, (size_t)1)) {
+            sprintf(s, "Releasing the semaphore failed; errno is %d\n", errno);
+            say(pName, s);
+        }
+    }
+    
+    return rc;
+}
+
+
+int acquire_semaphore(const char *pName, int sem_id, int live_dangerously) {
+    int rc = 0;
+    struct sembuf op[1];
+    char s[1024];
+
+    say(pName, "Waiting to acquire the semaphore.");
+
+    if (!live_dangerously) {
+        op[0].sem_num = 0;
+        op[0].sem_op = -1;
+        op[0].sem_flg = 0;
+        if (-1 == semop(sem_id, op, (size_t)1)) {
+            sprintf(s, "Acquiring the semaphore failed; errno is %d\n", errno);
+            say(pName, s);
+        }
+    }
+
+    return rc;
+}
+
+
+void read_params(struct param_struct *params) {
+    char line[1024];
+    char name[1024];
+    int value = 0;
+    
+    FILE *fp;
+    
+    fp = fopen("params.txt", "r");
+    
+    while (fgets(line, 1024, fp)) {
+        if (strlen(line) && ('#' == line[0]))
+            ; // comment in input, ignore
+        else {
+            sscanf(line, "%[ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghjiklmnopqrstuvwxyz]=%i\n", name, &value);
+        
+            // printf("name = %s, value = %d\n", name, value);
+
+            if (!strcmp(name, "ITERATIONS"))
+                params->iterations = value;
+            if (!strcmp(name, "LIVE_DANGEROUSLY"))
+                params->live_dangerously = value;
+            if (!strcmp(name, "KEY"))
+                params->key = value;
+            if (!strcmp(name, "PERMISSIONS"))
+                params->permissions = value;
+            if (!strcmp(name, "SHM_SIZE"))
+                params->size = value;
+                
+            name[0] = '\0';
+            value = 0;
+        }
+    }
+    
+    // printf("iterations = %d\n", params->iterations);
+    // printf("danger = %d\n", params->live_dangerously);
+    // printf("key = %d\n", params->key);
+    // printf("permissions = %o\n", params->permissions);
+    // printf("size = %d\n", params->size);
+}