* docs/MAIL.FILTERING: added note on removing procmail -f or

[mmh] / sbr / utils.c

diff --git a/sbr/utils.c b/sbr/utils.c
index 2120b84..7c4ddcf 100644 (file)
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -12,6 +12,14 @@
 #include <h/mh.h>
 #include <h/utils.h>
 #include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/*
+ * We allocate space for messages (msgs array)
+ * this number of elements at a time.
+ */
+#define MAXMSGS 256
 
 /*
  * Safely call malloc
@@ -39,6 +47,10 @@ mh_xrealloc(void *ptr, size_t size)
 {
     void *memory;
 
+    /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
+    if (!ptr)
+        return mh_xmalloc(size);
+
     if (size == 0)
         adios(NULL, "Tried to realloc 0bytes");
 
@@ -74,3 +86,145 @@ pwd(void)
 
     return curwd;
 }
+
+/*
+ * add   -- If "s1" is NULL, this routine just creates a
+ *       -- copy of "s2" into newly malloc'ed memory.
+ *       --
+ *       -- If "s1" is not NULL, then copy the concatenation
+ *       -- of "s1" and "s2" (note the order) into newly
+ *       -- malloc'ed memory.  Then free "s1".
+ */
+char *
+add (char *s2, char *s1)
+{
+    char *cp;
+    size_t len1 = 0, len2 = 0;
+
+    if (s1)
+        len1 = strlen (s1);
+    if (s2)
+        len2 = strlen (s2);
+
+    cp = mh_xmalloc (len1 + len2 + 1);
+
+    /* Copy s1 and free it */
+    if (s1) {
+        memcpy (cp, s1, len1);
+        free (s1);
+    }
+
+    /* Copy s2 */
+    if (s2)
+        memcpy (cp + len1, s2, len2);
+
+    /* Now NULL terminate the string */
+    cp[len1 + len2] = '\0';
+
+    return cp;
+}
+
+/*
+ * folder_exists
+ *      Check to see if a folder exists.
+ */
+int folder_exists(char *folder)
+{
+    struct stat st;
+    int exists = 0;
+
+    if (stat (folder, &st) == -1) {
+        /* The folder either doesn't exist, or we hit an error.  Either way
+         * return a failure.
+         */
+        exists = 0;
+    } else {
+        /* We can see a folder with the right name */
+        exists = 1;
+    }
+
+    return exists;
+}
+
+
+/*
+ * create_folder
+ *      Check to see if a folder exists, if not, prompt the user to create
+ *      it.
+ */
+void create_folder(char *folder, int autocreate, void (*done_callback)(int))
+{
+    struct stat st;
+    extern int errno;
+    char *cp;
+
+    if (stat (folder, &st) == -1) {
+        if (errno != ENOENT)
+            adios (folder, "error on folder");
+        if (autocreate == 0) {
+            /* ask before creating folder */
+            cp = concat ("Create folder \"", folder, "\"? ", NULL);
+            if (!getanswer (cp))
+                done_callback (1);
+            free (cp);
+        } else if (autocreate == -1) {
+            /* do not create, so exit */
+            done_callback (1);
+        }
+        if (!makedir (folder))
+            adios (NULL, "unable to create folder %s", folder);
+    }
+}
+
+/*
+ * num_digits
+ *      Return the number of digits in a nonnegative integer.
+ */
+int
+num_digits (int n)
+{
+    int ndigits = 0;
+
+    /* Sanity check */
+    if (n < 0)
+        adios (NULL, "oops, num_digits called with negative value");
+
+    if (n == 0)
+        return 1;
+
+    while (n) {
+        n /= 10;
+        ndigits++;
+    }
+
+    return ndigits;
+}
+
+/*
+ * Append a message arg to an array of them, resizing it if necessary.
+ * The function is written to suit the arg parsing code it was extracted
+ * from, and will probably be changed when the other code is cleaned up.
+ */
+void
+app_msgarg(struct msgs_array *msgs, char *cp)
+{
+       if(msgs->size >= msgs->max)
+               msgs->msgs = mh_xrealloc(msgs->msgs, (msgs->max+=MAXMSGS)*sizeof(*msgs->msgs));
+       msgs->msgs[msgs->size++] = cp;
+}
+
+/* Open a form or components file */
+int
+open_form(char **form, char *def)
+{
+       int in;
+       if (*form) {
+               if ((in = open (etcpath (*form), O_RDONLY)) == NOTOK)
+                       adios (*form, "unable to open form file");
+       } else {
+               if ((in = open (etcpath (def), O_RDONLY)) == NOTOK)
+                       adios (def, "unable to open default components file");
+               *form = def;
+       }
+       return in;
+}