X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/3b5f32c83c2a400dc28237b0d54c7765ef815b58..7b27ac3df95dd184f361531378ec145fd6d3b659:/sbr/utils.c

diff --git a/sbr/utils.c b/sbr/utils.c
index f5f20570..d6a96d84 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -358,9 +358,33 @@ nmh_strcasestr (const char *s1, const char *s2) {
 }
 
 
-/* EndsWithC returns true if non-NULL string s ends with a c before the
+/* HasPrefix returns true if non-NULL s starts with non-NULL prefix. */
+bool HasPrefix(const char *s, const char *prefix)
+{
+    while (*s && *s == *prefix) {
+        s++;
+        prefix++;
+    }
+
+    return *prefix == '\0';
+}
+
+
+/* HasSuffix returns true if non-NULL s ends with non-NULL suffix. */
+bool HasSuffix(const char *s, const char *suffix)
+{
+    size_t ls, lsuf;
+
+    ls = strlen(s);
+    lsuf = strlen(suffix);
+
+    return lsuf <= ls && !strcmp(s + ls - lsuf, suffix);
+}
+
+
+/* HasSuffixC returns true if non-NULL string s ends with a c before the
  * terminating NUL. */
-bool EndsWithC(char *s, int c)
+bool HasSuffixC(const char *s, int c)
 {
     return *s && s[strlen(s) - 1] == c;
 }
@@ -379,6 +403,26 @@ void TrimSuffixC(char *s, int c)
 }
 
 
+/* ToLower runs all of s through tolower(3). */
+void ToLower(char *s)
+{
+    unsigned char *b;
+
+    for (b = (unsigned char *)s; (*b = tolower(*b)); b++)
+        ;
+}
+
+
+/* ToUpper runs all of s through toupper(3). */
+void ToUpper(char *s)
+{
+    unsigned char *b;
+
+    for (b = (unsigned char *)s; (*b = toupper(*b)); b++)
+        ;
+}
+
+
 int
 nmh_init(const char *argv0, int read_context) {
     int status = OK;
@@ -470,7 +514,7 @@ nmh_version_changed (int older) {
            break for versions with multiple decimal points, etc. */
         const float current_version = strtof (VERSION, NULL);
         const float old_version =
-            context_version  &&  strncmp (context_version, "nmh-", 4) == 0
+            context_version  &&  HasPrefix(context_version, "nmh-")
             ?  strtof (context_version + 4, NULL)
             :  99999999;
 
@@ -495,9 +539,8 @@ nmh_version_changed (int older) {
 char *
 upcase (const char *str) {
     char *up = cpytrim (str);
-    char *cp;
 
-    for (cp = up; *cp; ++cp) { *cp = toupper ((unsigned char) *cp); }
+    ToUpper(up);
 
     return up;
 }