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Created By grepwood at 2014/06/13 11:52

1.   size_t grepline(char **lineptr, size_t *n, FILE * stream)
2.   {
3.     size_t len = 0;
4.     size_t offset = ftell(stream);
5.     char trash = 0;
6.     char * buf = NULL;
7.     char sizeofnewline = 0;
8.   /* Cleaning up after previous run */
9.     if(lineptr != NULL){
10.       free(*lineptr);
11.     }
12.   /* Reading the file until we suspect the line ends */
13.     do{
14.       trash = fgetc(stream);
15.       ++len;
16.     }while(!feof(stream) && trash != '\n' && trash != '\r');
17.   /* Windows and OSX newline detection */
18.     if(trash == '\r'){
19.       trash = fgetc(stream);
20.       if(trash == '\n'){
21.       ++sizeofnewline; /* It's a Windows newline */
22.       }
23.     }
24.   /* Going back and reading our line */
25.     fseek(stream,offset,SEEK_SET);
26.     buf = (char*)malloc(len+1);
27.     fread(buf,len,1,stream);
28.     if(sizeofnewline){
29.       trash = fgetc(stream);
30.     }
31.   /* Fixing the line in memory into a null-terminated LF line */
32.     buf[len-1] = '\n';
33.     buf[len] = '\0';
34.   /* Plugging our input pointers up the addresses we were using */
35.     *n = len;
36.     *lineptr = buf;
37.     return len;
38.   }