X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/4d78228c5d21c6320ecca02f587e167d0c6f024d..2417770134dfb5e942934143c41b4545400f0018:/sbr/utils.c

diff --git a/sbr/utils.c b/sbr/utils.c
index d3228909..c9769fb0 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -39,44 +39,61 @@ void *mh_xmalloc(size_t size)
     return p;
 }
 
-/*
- * Safely call realloc
- */
-void *
-mh_xrealloc(void *ptr, size_t size)
+/* Call realloc(3), exiting on NULL return. */
+void *mh_xrealloc(void *ptr, size_t size)
 {
-    void *memory;
+    void *new;
 
-    /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
+    /* Copy POSIX behaviour, coping with non-POSIX systems. */
+    if (size == 0) {
+        if (ptr) {
+            free(ptr);
+        }
+        return mh_xmalloc(1); /* Get a unique pointer. */
+    }
     if (!ptr)
         return mh_xmalloc(size);
 
-    if (size == 0)
-        adios(NULL, "Tried to realloc 0 bytes");
+    new = realloc(ptr, size);
+    if (!new)
+        adios(NULL, "realloc failed, size wanted: %zu", size);
 
-    memory = realloc(ptr, size);
-    if (!memory)
-        adios(NULL, "Realloc failed");
+    return new;
+}
 
-    return memory;
+/* Call calloc(3), exiting on NULL return. */
+void *mh_xcalloc(size_t nelem, size_t elsize)
+{
+    void *p;
+
+    if (!nelem || !elsize)
+        return mh_xmalloc(1); /* Get a unique pointer. */
+
+    p = calloc(nelem, elsize);
+    if (!p)
+        adios(NULL, "calloc failed, size wanted: %zu * %zu", nelem, elsize);
+
+    return p;
 }
 
-/*
- * Safely call calloc
- */
-void *
-mh_xcalloc(size_t nmemb, size_t size)
+/* Duplicate a NUL-terminated string, exit on failure. */
+char *mh_xstrdup(const char *src)
 {
-    void *memory;
+    size_t n;
+    char *dest;
 
-    if (nmemb == 0  ||  size == 0)
-        adios(NULL, "Tried to calloc 0 bytes");
+    n = strlen(src) + 1; /* Ignore possibility of overflow. */
+    dest = mh_xmalloc(n);
+    memcpy(dest, src, n);
 
-    if ((memory = calloc(nmemb, size))) {
-        return memory;
-    } else {
-        adios(NULL, "calloc failed");
-    }
+    return dest;
+}
+
+/* Call free(3), if ptr isn't NULL. */
+void mh_xfree(void *ptr)
+{
+    if (ptr)
+        free(ptr); /* Some very old platforms can't cope with NULL. */
 }
 
 /*
@@ -86,7 +103,7 @@ mh_xcalloc(size_t nmemb, size_t size)
 char *
 pwd(void)
 {
-    register char *cp;
+    char *cp;
     static char curwd[PATH_MAX];
 
     if (!getcwd (curwd, PATH_MAX)) {