Tweak comments.

[gnulib.git] / lib / exclude.c

diff --git a/lib/exclude.c b/lib/exclude.c
index fb735ee..7c038b2 100644 (file)
--- a/lib/exclude.c
+++ b/lib/exclude.c
@@ -26,6 +26,7 @@
 
 #include <stdbool.h>
 
+#include <ctype.h>
 #include <errno.h>
 #ifndef errno
 extern int errno;
@@ -58,6 +59,18 @@ extern int errno;
 # define SIZE_MAX ((size_t) -1)
 #endif
 
+#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
+# define IN_CTYPE_DOMAIN(c) true
+#else
+# define IN_CTYPE_DOMAIN(c) isascii (c)
+#endif
+
+static inline bool
+is_space (unsigned char c)
+{
+  return IN_CTYPE_DOMAIN (c) && isspace (c);
+}
+
 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
 
@@ -98,11 +111,10 @@ struct exclude
 struct exclude *
 new_exclude (void)
 {
-  struct exclude *ex = (struct exclude *) xmalloc (sizeof *ex);
+  struct exclude *ex = xmalloc (sizeof *ex);
   ex->exclude_count = 0;
   ex->exclude_alloc = (1 << 6); /* This must be a power of 2.  */
-  ex->exclude = (struct patopts *) xmalloc (ex->exclude_alloc
-                                           * sizeof ex->exclude[0]);
+  ex->exclude = xmalloc (ex->exclude_alloc * sizeof ex->exclude[0]);
   return ex;
 }
 
@@ -200,8 +212,7 @@ add_exclude (struct exclude *ex, char const *pattern, int options)
       if (! (0 < s && s <= SIZE_MAX / sizeof ex->exclude[0]))
        xalloc_die ();
       ex->exclude_alloc = s;
-      ex->exclude = (struct patopts *) xrealloc (ex->exclude,
-                                                s * sizeof ex->exclude[0]);
+      ex->exclude = xrealloc (ex->exclude, s * sizeof ex->exclude[0]);
     }
 
   patopts = &ex->exclude[ex->exclude_count++];
@@ -210,8 +221,9 @@ add_exclude (struct exclude *ex, char const *pattern, int options)
 }
 
 /* Use ADD_FUNC to append to EX the patterns in FILENAME, each with
-   OPTIONS.  LINE_END terminates each pattern in the file.  Return -1
-   on failure, 0 on success.  */
+   OPTIONS.  LINE_END terminates each pattern in the file.  If
+   LINE_END is a space character, ignore trailing spaces and empty
+   lines in FILE.  Return -1 on failure, 0 on success.  */
 
 int
 add_exclude_file (void (*add_func) (struct exclude *, char const *, int),
@@ -255,12 +267,28 @@ add_exclude_file (void (*add_func) (struct exclude *, char const *, int),
     e = errno;
 
   buf = xrealloc (buf, buf_count + 1);
+  buf[buf_count] = line_end;
+  lim = buf + buf_count + ! (buf_count == 0 || buf[buf_count - 1] == line_end);
+  pattern = buf;
 
-  for (pattern = p = buf, lim = buf + buf_count;  p <= lim;  p++)
-    if (p < lim ? *p == line_end : buf < p && p[-1])
+  for (p = buf; p < lim; p++)
+    if (*p == line_end)
       {
-       *p = '\0';
+       char *pattern_end = p;
+
+       if (is_space (line_end))
+         {
+           for (; ; pattern_end--)
+             if (pattern_end == pattern)
+               goto next_pattern;
+             else if (! is_space (pattern_end[-1]))
+               break;
+         }
+
+       *pattern_end = '\0';
        (*add_func) (ex, pattern, options);
+
+      next_pattern:
        pattern = p + 1;
       }