Bei Verwendung von strcpy wird Müll gedruckt
Ich habe eine Funktion, die einige eingehende Daten analysiert. Mein Problem ist, dass ich nach der Verwendung von strncpy einen Müll bekomme, wenn ich versuche, ihn zu drucken. Ich versuche, Malloc zu verwenden, um das Char-Array auf die exakte Größe zu bringen.
Code:
void parse_data(char *unparsed_data)
{
char *temp_str;
char *pos;
char *pos2;
char *key;
char *data;
const char newline = '\n';
int timestamp = 0;
temp_str = (char*)malloc(strlen(unparsed_data));
g_print("\nThe original string is: \n%s\n",unparsed_data);
//Ignore the first two lines
pos = strchr(unparsed_data, newline);
strcpy(temp_str, pos+1);
pos = strchr(temp_str, newline);
strcpy(temp_str, pos+1);
//Split the line in two; The key name and the value
pos = strchr(temp_str, ':'); // ':' divides the name from the value
pos2 = strchr(temp_str, '\n'); //end of the line
key = (char*)malloc((size_t)(pos-temp_str)-1); //allocate enough memory
data = (char*)malloc((size_t)(pos2-pos)-1);
strncpy(key, temp_str, (size_t)(pos-temp_str));
strncpy(data, pos + 2, (size_t)(pos2-pos));
timestamp = atoi(data);
g_print("size of the variable \"key\" = %d or %d\n", (size_t)(pos-temp_str), strlen(key));
g_print("size of the variable \"data\" = %d or %d\n", (size_t)(pos2-pos), strlen(data));
g_print("The key name is %s\n",key);
g_print("The value is %s\n",data);
g_print("End of Parser\n");
}
Ausgabe:
The original string is:
NEW_DATAa_PACKET
Local Data Set 16-byte Universal Key
Time Stamp (microsec): 1319639501097446
Frame Number: 0
Version: 3
Angle (deg): 10.228428
size of the variable "key" = 21 or 22
size of the variable "data" = 18 or 21
The key name is Time Stamp (microsec)
The value is 1319639501097446
F32
End of Parser
Führen Sie es erneut aus:
The original string is:
NEW_DATAa_PACKET
Local Data Set 16-byte Universal Key
Time Stamp (microsec): 1319639501097446
Frame Number: 0
Version: 3
Angle (deg): 10.228428
size of the variable "key" = 21 or 25
size of the variable "data" = 18 or 18
The key name is Time Stamp (microsec)ipe
The value is 1319639501097446
F
End of Parser