[PATCH] cleanup mult field string handling

Here I try to cleanup our various multifield iteration over the strings.
Inspired by our nice list.h we now have a macro to iterate over the string
and process the parts of it:
It makes the code more readable and we don't change the string while we
process it like the former strsep() does.

Example:

  foreach_strpart(dev->symlink, " ", pos, len) {
  	if (strncmp(&dev->symlink[pos], find_name, len) != 0)
  		continue;

  	...
  }

For the callout part selector %c{2} we separate now not only by space but
also newline and return characters, cause some programs may give multiline
values back. A possible RESULT match must contain wildcards for these
characters.

Also a bug in the recent udevinfo symlink query feature is fixed.

1 files changed, 2 insertions, 0 deletions

diff --git a/udevinfo.8 b/udevinfo.8
index 528fa4ad95..e087e2d1ff 100644
--- a/udevinfo.8
+++ b/udevinfo.8
@@ -35,6 +35,8 @@ Specify the sysfs path of the device to query.
 .TP
 .BI \-n " name"
 Specify the name of the node or the symlink for the device to query.
+Partition names generated with the NAME{all_partitons} option can not be
+queried, the main device must be used instead.
 .TP
 .B \-a
 Print all