git.ozlabs.org Git - petitboot/blob - lib/fold/fold.c

   1
   2 #include "fold/fold.h"
   3
   4 void fold_text(const char *text,
   5                 int linelen,
   6                 int line_cb(void *arg, const char *start, int len),
   7                 void *arg)
   8 {
   9         const char *start, *end, *sep;
  10         int rc = 0;
  11
  12         start = end = sep = text;
  13
  14         while (!rc) {
  15
  16                 if (*end == '\n') {
  17                         rc = line_cb(arg, start, end - start);
  18                         start = sep = ++end;
  19
  20                 } else if (*end == '\0') {
  21                         line_cb(arg, start, end - start);
  22                         rc = 1;
  23
  24                 } else if (end - start >= linelen - 1) {
  25                         if (sep != start) {
  26                                 /* split on a previous word boundary, if
  27                                  * possible */
  28                                 rc = line_cb(arg, start, sep - start);
  29                                 start = end = ++sep;
  30                         } else {
  31                                 /* otherwise, break the word */
  32                                 end++;
  33                                 rc = line_cb(arg, start, end - start);
  34                                 start = sep = end;
  35                         }
  36
  37                 } else {
  38                         end++;
  39                         /* record our last separator */
  40                         if (*end == ' ')
  41                                 sep = end;
  42                 }
  43         }
  44 }