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Description of problem:
gencat -H references memory just below a malloc()ed block.  act_len can get
decremented to zero, not tested, yet used to index buf[act_len -1].

Version-Release number of selected component (if applicable):
glibc-2.3.2-11.9

How reproducible:
Always

Steps to Reproduce:
1.Run catgets testcase:  gencat -H test-gencat.h < sample.SJIS
with a breakpoint at gencat.c:336:
-----
          if (buf[act_len - 1] == '\n')
            {
              --act_len;

              /* There might be more than one backslash at the end of
                 the line.  Only if there is an odd number of them is
                 the line continued.  */
              if (buf[act_len - 1] == '\\')   ### act_len can be 0
-----

2. Observe the case when 0==act_len and a reference is made to buf[act_len -1].
3.
    

Actual Results:  'buf' is referenced at index -1, which is outside the bounds of
a malloc()ed block.

Expected Results:  No reference outside the bounds of a malloc()ed block.

Additional info: