Why this code is not working as expected ?

[milan.rajik]

Why this code is not working as expected ?

I need to extract date and time from AT+CMGR header. The function has these arguments.

*s1 = in buffer
*s2 = out buffer

It works like this. It loops unsti it finds the 7th double quotes and then after coming out of loop it increments once. Then it loops again until '+' is encountered which is 1st '+' after 7th '"'. so, p = 7 and q = 1. Also if *s1 and *s2 is loaded into watch window it doesn't show the whole array.

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Code C - [expand]
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char buffer1[] = "+CMGR: \"REC UNREAD\",\"+919900516837\",\"\",\"14/12/17,23:44:27+22\"\r\n20!4#gt\r\n\r\n";
char buffer2[20];
 
void GSM_Split(char *s1, char *s2, char p, unsigned int startIndexP, char q, unsigned startIndexQ) {
 
      unsigned int a = 0, b = 0;
      
      while(a != startIndexP) {
 
             if(*s1 == p)a++;
             *s1++;
      }
      
      *s1++;
      
      while(b != startIndexQ) {
             if(*s1 == q)b++;
             *s2++ = *s1++;
      }
      
      *s2 = '\0';
}
 
GSM_Split(buffer1, buffer2, '"', 7, '+', 1);

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[paulfjujo]

hello,

i encountered some problems when using "\" caractere
in a string variable.. because interpreted as an escape sequence car
(like the use of \r or \n).
the counter measure i applied is to use the ascii code of "\" in the right place inside
the char buffer.

it was for declare a file path with sub directories..y

 

[betwixt]

Try looping 'strtok( )' 7 times with quotes as the search character, it will return a pointer to the character after the 7th quote which is date and time you are after.
You can also do it by searching for the commas in the string using the same method.

Brian.

 

[milan.rajik]

Ok. Thank you. I will try to use strtok().