Two new string functions

mu_string_prefix(A, B) returns true if B is the prefix of A.
mu_string_suffix(A, B) returns true if B is the suffix of A.

* include/mailutils/cstr.h (mu_string_prefix)
(mu_string_suffix): protos.
* libmailutils/string/Makefile.am: Add new files.
* libmailutils/string/strpref.c: New file.
* libmailutils/string/strsuf.c: New file.

4 files changed, 30 insertions, 0 deletions

diff --git a/include/mailutils/cstr.h b/include/mailutils/cstr.h
index a27942249..4ef55be89 100644
--- a/include/mailutils/cstr.h
+++ b/include/mailutils/cstr.h
@@ -31,6 +31,9 @@ int mu_c_strcasecmp (const char *a, const char *b);
 int mu_c_strncasecmp (const char *a, const char *b, size_t n);
 char *mu_c_strcasestr (const char *haystack, const char *needle);
 
+int mu_string_prefix (char const *str, char const *pfx);
+int mu_string_suffix (char const *str, char const *sfx);
+  
 size_t mu_rtrim_class (char *str, int __class);
 size_t mu_rtrim_cset (char *str, const char *cset);
 size_t mu_ltrim_class (char *str, int __class);
diff --git a/libmailutils/string/Makefile.am b/libmailutils/string/Makefile.am
index 1eb58dea4..5cdd73913 100644
--- a/libmailutils/string/Makefile.am
+++ b/libmailutils/string/Makefile.am
@@ -32,7 +32,9 @@ libstring_la_SOURCES = \
  str_to_c.c\
  strcount.c\
  strltrim.c\
+ strpref.c\
  strskip.c\
+ strsuf.c\
  stripws.c\
  strlst.c\
  strrtrim.c\
diff --git a/libmailutils/string/strpref.c b/libmailutils/string/strpref.c
new file mode 100644
index 000000000..43392ffa1
--- /dev/null
+++ b/libmailutils/string/strpref.c
@@ -0,0 +1,12 @@
+#include <config.h>
+#include <string.h>
+#include <mailutils/cstr.h>
+
+int
+mu_string_prefix (char const *str, char const *pfx)
+{
+  size_t len = strlen (pfx);
+  if (strlen (str) < len)
+    return 0;
+  return memcmp (str, pfx, len) == 0;
+}
diff --git a/libmailutils/string/strsuf.c b/libmailutils/string/strsuf.c
new file mode 100644
index 000000000..273d2f641
--- /dev/null
+++ b/libmailutils/string/strsuf.c
@@ -0,0 +1,13 @@
+#include <config.h>
+#include <string.h>
+#include <mailutils/cstr.h>
+
+int
+mu_string_suffix (char const *str, char const *sfx)
+{
+  size_t sfxlen = strlen (sfx);
+  size_t len = strlen (str); 
+  if (len < sfxlen)
+    return 0;
+  return memcmp (str + len - sfxlen, sfx, sfxlen) == 0;
+}