X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/7111aba92b83fff6b0ac8637dd1f6e2fa287ac8c..34f0ab116ad7734e96127d3cd046861a5c82c11c:/sbr/utils.c

diff --git a/sbr/utils.c b/sbr/utils.c
index 1b1b4738..5b7b19f1 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -25,62 +25,62 @@ 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");
+        size = 1; /* Some mallocs don't like 0. */
+    p = malloc(size);
+    if (!p)
+        adios(NULL, "malloc failed, size wanted: %zu", size);
 
-    memory = malloc(size);
-    if (!memory)
-        adios(NULL, "Malloc failed");
-
-    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");
-
-    memory = realloc(ptr, size);
-    if (!memory)
-        adios(NULL, "Realloc failed");
+    new = realloc(ptr, size);
+    if (!new)
+        adios(NULL, "realloc failed, size wanted: %zu", size);
 
-    return memory;
+    return new;
 }
 
-/*
- * Safely call calloc
- */
-void *
-mh_xcalloc(size_t nmemb, size_t size)
+/* Call calloc(3), exiting on NULL return. */
+void *mh_xcalloc(size_t nelem, size_t elsize)
 {
-    void *memory;
+    void *p;
 
-    if (nmemb == 0  ||  size == 0)
-        adios(NULL, "Tried to calloc 0 bytes");
+    if (!nelem || !elsize)
+        return mh_xmalloc(1); /* Get a unique pointer. */
 
-    if ((memory = calloc(nmemb, size))) {
-        return memory;
-    } else {
-        adios(NULL, "calloc failed");
-    }
+    p = calloc(nelem, elsize);
+    if (!p)
+        adios(NULL, "calloc failed, size wanted: %zu * %zu", nelem, elsize);
+
+    return p;
+}
+
+/* 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. */
 }
 
 /*
@@ -390,15 +390,15 @@ nmh_init(const char *argv0, int read_context) {
             isatty (fileno (stdout))  &&  isatty (fileno (stderr))) {
             if (nmh_version_changed (check_older_version)) {
                 printf ("==================================================="
-                        "====================\n");
+                        "=====================\n");
                 printf ("Welcome to nmh version %s\n\n", VERSION);
-                printf ("See the release notes in %s/NEWS .\n\n",
+                printf ("See the release notes in %s/NEWS\n\n",
                          mhdocdir);
                 print_intro (stdout, 1);
                 printf ("\nThis message will not be repeated until "
                         "nmh is next updated.\n");
                 printf ("==================================================="
-                        "====================\n\n");
+                        "=====================\n\n");
 
                 fputs ("Press enter to continue: ", stdout);
                 (void) read_line ();
@@ -410,7 +410,7 @@ 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;
     }
@@ -429,7 +429,7 @@ nmh_version_changed (int older) {
     if (older) {
         /* Convert the version strings to floats and compare them.  This will
            break for versions with multiple decimal points, etc. */
-        const float current_version = strtod (VERSION, NULL);
+        const float current_version = strtof (VERSION, NULL);
         const float old_version =
             context_version  &&  strncmp (context_version, "nmh-", 4) == 0
             ?  strtof (context_version + 4, NULL)
@@ -484,3 +484,25 @@ contains8bit(const char *start, const char *end)
 
     return 0;
 }
+
+
+/*
+ * See if input has any 8-bit bytes.
+ */
+int
+scan_input (int fd, int *eightbit) {
+    int state;
+    char buf[BUFSIZ];
+
+    *eightbit = 0;
+    lseek (fd, (off_t) 0, SEEK_SET);
+
+    while ((state = read (fd, buf, sizeof buf)) > 0) {
+        if (contains8bit (buf, buf + state)) {
+            *eightbit = 1;
+            return OK;
+        }
+    }
+
+    return state == NOTOK  ?  NOTOK  :  OK;
+}