X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/75b164e2434686240fb4005432dc404f80cd8536..ecc4ea809452d95ab51ff8669d66fe0549260377:/sbr/utils.c?ds=inline

diff --git a/sbr/utils.c b/sbr/utils.c
index f24f00de..c9769fb0 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -25,62 +25,75 @@ extern char *mhdocdir;
  */
 #define MAXMSGS 256
 
-/*
- * Safely call malloc
- */
-void *
-mh_xmalloc(size_t size)
+/* Call malloc(3), exiting on NULL return. */
+void *mh_xmalloc(size_t size)
 {
-    void *memory;
+    void *p;
 
     if (size == 0)
-        adios(NULL, "Tried to malloc 0 bytes");
-
-    memory = malloc(size);
-    if (!memory)
-        adios(NULL, "Malloc failed");
+        size = 1; /* Some mallocs don't like 0. */
+    p = malloc(size);
+    if (!p)
+        adios(NULL, "malloc failed, size wanted: %zu", size);
 
-    return memory;
+    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 0bytes");
+    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;
+}
+
+/* Call calloc(3), exiting on NULL return. */
+void *mh_xcalloc(size_t nelem, size_t elsize)
+{
+    void *p;
 
-    return memory;
+    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. */
 }
 
 /*
@@ -90,7 +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)) {
@@ -410,7 +423,7 @@ nmh_init(const char *argv0, int read_context) {
     } else {
         int status = context_foil(NULL);
         if (status != OK) {
-            advise("", "failed to create minimal profile/conext");
+            advise("", "failed to create minimal profile/context");
         }
         return status;
     }