skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
git clone https://ccx.te2000.cz/git/skalibs
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getlnmax.c (713B)

      1 /* ISC license. */
      2 
      3 #include <sys/uio.h>
      4 #include <errno.h>
      5 
      6 #include <skalibs/buffer.h>
      7 #include <skalibs/siovec.h>
      8 #include <skalibs/skamisc.h>
      9 
     10 int getlnmax (buffer *b, char *d, size_t max, size_t *w, char sep)
     11 {
     12   if (*w > max) return (errno = EINVAL, -1) ;
     13   for (;;)
     14   {
     15     size_t len = buffer_len(b) ;
     16     struct iovec v[2] ;
     17     size_t pos ;
     18     ssize_t r ;
     19     buffer_rpeek(b, v) ;
     20     if (len > max - *w) len = max - *w ;
     21     pos = siovec_bytechr(v, 2, sep) ;
     22     if (pos > len) pos = len ;
     23     r = pos < len ; pos += r ;
     24     buffer_getnofill(b, d + *w, pos) ; *w += pos ;
     25     if (r) return 1 ;
     26     if (*w >= max) return (errno = ERANGE, -1) ;
     27     r = buffer_fill(b) ;
     28     if (r <= 0) return r ;
     29   }
     30 }