search and replace C code

vexer · 05-17-2004, 09:34 PM

I'm trying to find a way to search and replace words in a file. I figured i'd try fseek() to help me but I'm still unsure of how to do it. Could I get your input/links.

jim mcnamara · 05-18-2004, 12:27 PM

GNU Search and Replace gsar has already done it -
search and replace is a somewhat complex thing.
You can download the source here to see how it works -

http://www.jsiinc.com/SUBL/tip5800/rh5801.htm

vexer · 05-18-2004, 07:36 PM

Hmm, what if I was to make the program look at the text and then output the changed text to a file?

Ok, to understand better, I'm trying to create a intel asm to at&t asm syntax changer. The program will basicly grab intel asm source code and change all of it's code into at&t syntax. So, I need to change all the registers from reg to %reg and change instructions as well.

So basicly, I'm trying to find a way to do this with less effort possible. So my program should :

1.Take first line
2.Examin first line
3.Change what needs changing
4.Go to line++
5. End of line? yes quit, no continue to 6.
6.Go to 1

vexer · 05-18-2004, 11:11 PM

I wrote some code, not sure if it works, what's your opinion?

Code:

int inChar,location=0;
while ((inChar=getc(infile)) != EOF) {
	if ((inChar=getc(infile)) != " ") { //  If not a space
                       takethis[location] = inChar;  // put the character in takethis
                       takethis[location+1]='\0'}    // add 1 and add a end of line
                       location++;                       // keep going through the list untill we get
                                                             // a space
	for (i, i<12, i++) {                                         
		if ( strcmp(takethis, lookup[i]) == 0 ) {        // at space, take what we had
				sprintf(fileout, replace[i]+" ");     // look it up in lookup list
		} // end if                                               // see if it needs replacing and 
	} // end for                                                     // do it

	location++; // needed so I can keep going after the space
} // end while