mess822_fold.c

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#include "mess822.h"
 
int mess822_fold(stralloc *out,stralloc *in,char *prefix,int linelen)
{
  int i;
  int j;
  int k;
  int partial;
 
  if (!stralloc_copys(out,prefix)) return 0;
  partial = out->len;
 
  for (j = i = 0; j <= in->len; ++j)
    if ((j == in->len) || (in->s[j] == '\n')) {
      k = i;
      while ((in->s[k] == ' ') && (in->s[k + 1] == ' ')) ++k;
      if (i && (partial + j - k > linelen)) {
        if (!stralloc_cats(out,"\n")) return 0;
        if (!stralloc_catb(out,in->s + i,j - i)) return 0;
        partial = j - i;
      }
      else {
        if (!stralloc_catb(out,in->s + k,j - k)) return 0;
        partial += j - k;
      }
      i = j + 1;
    }
 
  if (!stralloc_append(out,"\n")) return 0;
 
  return 1;
}