lib/splitline.c

   1 /*
   2  * splitline: splits a line into a list of parameters.
   3  *
   4  * This function works "in place", i.e. the original input string is destroyed.
   5  *
   6  * This function splits lines on each space, up to a maximum of maxparams.
   7  * Spaces at the beginning/between words are replaced with '\0', as are all
   8  * \r or \n characters.
   9  *
  10  * If "coloncheck" is nonzero, a parameter beginning with ':' will be treated
  11  * as the last.  The inevitable exception to this is the _first_ parameter...
  12  */
  13
  14 int splitline(char *inputstring, char **outputvector, int maxparams, int coloncheck) {
  15   char *c;
  16   int instr=0; /* State variable: 0 = between params, 1 = in param */
  17   int paramcount=0;
  18
  19   for (c=inputstring;*c;c++) {
  20     if (instr) {
  21       if (*c==' ') {
  22         /* Space in string -- end string, obliterate */
  23         *c='\0';
  24         instr=0;
  25       }
  26     } else {
  27       if (*c==' ') {
  28         /* Space when not in string: obliterate */
  29         *c='\0';
  30       } else {
  31         /* Non-space character, start new word. */
  32         if (*c==':' && coloncheck && paramcount) {
  33           outputvector[paramcount++]=c+1;
  34           break;
  35         } else if (paramcount+1==maxparams) {
  36           outputvector[paramcount++]=c;
  37           break;
  38         } else {
  39           outputvector[paramcount++]=c;
  40           instr=1;
  41         }
  42       }
  43     }
  44   }
  45
  46   return paramcount;
  47 }
  48
  49 /*
  50  * This function reconnects extra arguments together with spaces.
  51  *
  52  * Multiple spaces will be not be removed
  53  *
  54  * USE WITH CARE -- you don't have to worry about the original string
  55  * being untrusted, but you must get the arguments right :)
  56  */
  57
  58 void rejoinline(char *input, int argstojoin) {
  59   int i=0;
  60   int inword=0;
  61   char *ch;
  62
  63   if (argstojoin<2) {
  64     return;
  65   }
  66
  67   for (ch=input;;ch++) {
  68     if (inword) {
  69       if (*ch=='\0') {
  70         i++;
  71         if (i==argstojoin) {
  72           /* We're done */
  73           return;
  74         } else {
  75           *ch=' ';
  76           inword=0;
  77         }
  78       }
  79     } else {
  80       /* not in word.. */
  81       if (*ch!='\0') {
  82         inword=1;
  83       } else {
  84         *ch=' ';
  85       }
  86     }
  87   }
  88 }
  89