Parsing a file using C program

[kalyanr12]

Gurus,

I have a file with the below content:

ALT_ATF2_B0_MAP [UINT(16),(1,5)] 5557 ; 5557
: 7075 ; 7075
: 7075 ; 7075
: 7075 ; 7075
: 7075 ; 7075
ALT_ATF2_B1_MAP [UINT(16),(1,5)] 10250 ; 10250
: 12621 ; 12621
: 12621 ; 12621
: 12621 ; 12621
: 12621 ; 12621
ALT_ATF2_B2_MAP [UINT(16),(1,5)] 4776 ; 4776
: 5692 ; 5692
: 5692 ; 5692
: 5692 ; 5692
: 5692 ; 5692
ALT_ATF2_VEHICLE_SPEED_MAP_VTD [UINT(16),(1,5)] 0 ; 0
: 640 ; 640
: 1280 ; 1280
: 2944 ; 2944
: 5760 ; 5760
ALT_COMP_EAC_A1 [INT(16)] 12205 ; 12205
ALT_COMP_EAC_A2 [INT(16)] 4072 ; 4072
ALT_COMP_EAC_B0 [INT(16)] 7674 ; 7674
ALT_COMP_EAC_B1 [INT(16)] 14221 ; 14221
ALT_COMP_EAC_B2 [INT(16)] 6606 ; 6606
ALT_COMP_EAC_BOOST [INT(16)] 164 ; 20.5

In the above file, I need to parse and read only those lines which have ",(" as delimiter for e.x
ALT_ATF2_VEHICLE_SPEED_MAP_VTD [UINT(16),(1,5)] 0 ; 0

Once we encounter this string, I need to do the following:
1) Store the first string in that line to a variable e.x ALT_ATF2_VEHICLE_SPEEAD_MAP_VTD needs to be stored in a variable
2) Secondly, at the end of the line there are 0; 0 and there are 4 more lines below this line. All are part of one entry. For E.x
ALT_ATF2_VEHICLE_SPEED_MAP_VTD [UINT(16),(1,5)] 0 ; 0
: 640 ; 640
: 1280 ; 1280
: 2944 ; 2944
: 5760 ; 5760

In the above, after we store ALT_ATF2_VEHICLE_SPEED_MAP_VTD in one variable. This corresponds to a property name in our software and has to be assigned with an array of values, which are nothing but 0, 640, 1280, 2944, 5760. These have to be the first values in the set ( for e.x 640; 640 => we need to store the first 640 only in the array).

We need to get all the first values into an array till we see another totally independent line entry like ALT_COMP_EAC_A1 [INT(16)] 12205 ; 12205

Once the values are obtained, we can use our Software API's to set the property with the obtained set of array of values.

Appreciate if anyone can help me with the parsing logic as I am finding it difficult to code.

[KCfromNC]

Why are you doing this in C? If there was ever a job for Perl, you've found it.

Ignoring that what have you written so far? I'd imagine you'd make use of the strstr() function for starters to look for ",(".

[tabstop]

Read a line.
Search for ,( (if that's your key phrase)
If you find it, then split apart the line you're on into its pieces (sscanf seems like a plan here)
If you don't, then see if it starts with a : -- if so, read some numbers
If it doesn't, then presumably you've got one of those one-line things that you don't seem to care about.

[anduril462]

Read the homework policy. Then, read the docs for strstr, fscanf and maybe strtok. Show us some effort by posting the code you've tried, and ask some more specific questions, and you'll probably get much better help.

[derder]

I've found this code on the net:

void Tokenize(const string str, vector<string>& tokens, const string& delimiters){ 
   int startpos = 0;
    int pos = str.find_first_of(delimiters, startpos);    
string strTemp;    
while (string::npos != pos || string::npos != startpos)    {        
strTemp = str.substr(startpos, pos - startpos);        
tokens.push_back(strTemp.substr(0, strTemp.length()));        
startpos = str.find_first_not_of(delimiters, pos);        
pos = str.find_first_of(delimiters, startpos);    }}

Of course, it is written in C++, so you have to find some vector routine for C.

[Linux Trojan]

Why are you doing this in C? If there was ever a job for Perl, you've found it.

Ignoring that what have you written so far? I'd imagine you'd make use of the strstr() function for starters to look for ",(".

Wow. I was gonna learn Perl but I put it aside coz I thought nothing can beat C for parsing. Is Perl really better in this regard?

[CommonTater]

I've found this code on the net:

Please don't go searching the net the posting *other people's code* here. This is a C programming forum, it's about learning and writing C code... it is NOT about trading code snippets found on the web.

[Adak]

Perl is a general purpose language, but has extensive parsing text for report writing, features.

You can parse the stink out of ........ with C if you like, but it's not as easy. If you already know C, I would use it, but if you're going to be learning a new language for this purpose, then Perl is the better language for the job.

Having said that, you seem to have the logic already well thought out, so if you have included string.h, then:

fgets() each line into a one line char buffer

use strstr() on that buffer to see if it has the target ,( chars.

Save your data.

Parsing strings is an acquired taste.