Diff: device/DeviceConfiguration.cpp

Revision:

1:cac9b2960637

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/device/DeviceConfiguration.cpp	Sun Feb 15 22:04:12 2015 +0000
@@ -0,0 +1,183 @@
+#include "DeviceConfiguration.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+DeviceConfiguration::DeviceConfiguration()
+{
+    size_t i;
+    
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        _items[i].key = NULL;
+        _items[i].value = NULL;
+    }
+}
+
+DeviceConfiguration::~DeviceConfiguration()
+{
+    clear();
+}
+
+bool DeviceConfiguration::read(const char *str)
+{
+    const char *ptr, *ptr2, *ptr3; size_t i, j, len1, len2;
+    DeviceConfiguration::KeyValue items[DEVICE_CONFIGURATION_SIZE];
+    
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        items[i].key = NULL;
+        items[i].value = NULL;
+    }
+
+    ptr = str;
+    i = 0;
+    while ((*ptr != '\0') && (i < DEVICE_CONFIGURATION_SIZE)) {
+        if (((ptr2 = strchr(ptr, '=')) == NULL) ||
+            ((ptr3 = strchr(ptr2+1, ';')) == NULL))
+            goto failure;
+        
+        len1 = ptr2-ptr;
+        len2 = ptr3-ptr2 - 1;
+        
+        if ((memchr(ptr, ';', len1) != NULL) ||
+            (memchr(ptr2+1, '=', len2) != NULL))
+            goto failure;
+        
+        for (j = 0; j < DEVICE_CONFIGURATION_SIZE; j++) {
+            if ((items[j].key != NULL) && (strlen(items[j].key) == len1) && (strncmp(items[j].key, ptr, len1) == 0))
+                goto failure;
+        }
+
+        if ((items[i].key = (char*)malloc(len1+1)) == NULL)
+            goto failure;
+        if ((items[i].value = (char*)malloc(len2+1)) == NULL) {
+            free(items[i].key);
+            items[i].key = NULL;
+            goto failure;
+        }
+        
+        strncpy(items[i].key, ptr, len1);
+        strncpy(items[i].value, ptr2+1, len2);
+        items[i].key[len1] = '\0';
+        items[i].value[len2] = '\0';
+
+        i++;
+        ptr = ptr3+1;
+    }
+    
+    if (*ptr != '\0')
+        goto failure;
+    
+    clear();
+    memcpy(_items, items, sizeof(DeviceConfiguration::KeyValue)*DEVICE_CONFIGURATION_SIZE);
+    return true;
+
+failure:
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        if (items[i].key != NULL) {
+            free(items[i].key);
+            free(items[i].value);
+        }
+    }
+    
+    return false;
+}
+
+bool DeviceConfiguration::write(char *buf, size_t len)
+{
+    char *ptr; size_t i; int ret, ln;
+    
+    ptr = buf;
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        if (_items[i].key == NULL)
+            continue;
+
+        ret = snprintf(ptr, len, "%s=%s;%n", _items[i].key, _items[i].value, &ln);
+        if ((ret < 0) || (ret >= len))
+            return false;
+
+        ptr += ln;
+        len -= ln;
+    }
+    
+    return true;
+}
+
+bool DeviceConfiguration::set(const char *key, const char *value)
+{
+    KeyValue *item; size_t i;
+    
+    if ((item = search(key)) == NULL) {
+        for (i = 0; (i < DEVICE_CONFIGURATION_SIZE) && (item == NULL); i++) {
+            if (_items[i].key == NULL)
+                item = &_items[i];
+        }
+    }
+    
+    if (item == NULL)
+        return false;
+    
+    if ((item->key = (char*)malloc(strlen(key)+1)) == NULL)
+        return false;
+    if ((item->value = (char*)malloc(strlen(value)+1)) == NULL) {
+        free(item->key);
+        item->key = NULL;
+        return false;
+    }
+    
+    strcpy(item->key, key);
+    strcpy(item->value, value);
+    return true;
+}
+
+const char * DeviceConfiguration::get(const char *key)
+{
+    KeyValue *item;
+    
+    if ((item = search(key)) == NULL)
+        return NULL;
+    
+    return item->value;
+}
+
+bool DeviceConfiguration::unset(const char *key)
+{
+    KeyValue *item;
+    
+    if ((item = search(key)) == NULL)
+        return false;
+    
+    free(item->key);
+    free(item->value);
+    item->key = NULL;
+    item->value = NULL;
+    return true;
+}
+
+bool DeviceConfiguration::has(const char *key)
+{
+    return (search(key) != NULL);
+}
+
+void DeviceConfiguration::clear()
+{
+    size_t i;
+    
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        if (_items[i].key != NULL) {
+            free(_items[i].key);
+            free(_items[i].value);
+        }
+    }
+}
+
+DeviceConfiguration::KeyValue * DeviceConfiguration::search(const char *key)
+{
+    size_t i;
+    
+    for (i = 0; i < DEVICE_CONFIGURATION_SIZE; i++) {
+        if (strcmp(key, _items[i].key) == 0)
+            return &_items[i];
+    }
+    
+    return NULL;
+}