src/lib/libc/stdio/fgetln.3 - diff

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Diff for /src/lib/libc/stdio/fgetln.3 between version 1.13 and 1.14

-version 1.13, 2004/04/21 00:21:04
+version 1.14, 2004/05/10 17:15:28
 Line 115  or
 Line 115  or
 Line 115  or
  .Sh SEE ALSO
  .Xr ferror 3 ,
  .Xr fgets 3 ,
- .Xr fgetstr 3 ,
  .Xr fopen 3 ,
  .Xr putc 3
  .Sh HISTORY
-Line 123  The
+Line 122  The
 Line 123  The
 Line 122  The
  .Fn fgetln
  function first appeared in
  .Bx 4.4 .
- .Sh NOTES
+ .Sh CAVEATS
- The
+ Since the returned buffer is not a C string (it is not null terminated), a
- .Fn fgetln
+ common practice is to replace the newline character with
- function is equivalent to
+ .Sq \e0 .
- .Fn fgetstr
+ However, if the last line in a file does not contain a newline,
- with a \en
+ the returned text won't contain a newline either.
- .Fa delim .
+ The following code demonstrates how to deal with this problem by allocating a
+ temporary buffer:
+ .Bd -literal
+         char *buf, *lbuf;
+         size_t len;
+         lbuf = NULL;
+         while ((buf = fgetln(fp, &len))) {
+                 if (buf[len - 1] == '\en')
+                         buf[len - 1] = '\e0';
+                 else {
+                         if ((lbuf = (char *)malloc(len + 1)) == NULL)
+                                 err(1, NULL);
+                         memcpy(lbuf, buf, len);
+                         lbuf[len] = '\e0';
+                         buf = lbuf;
+                 }
+                 printf("%s\en", buf);
+                 if (lbuf != NULL) {
+                         free(lbuf);
+                         lbuf = NULL;
+                 }
+         }
+ .Ed

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