-
/*
- * utils.c -- various utility routines
- *
- * $Id$
- *
- * This code is Copyright (c) 2006, by the authors of nmh. See the
- * COPYRIGHT file in the root directory of the nmh distribution for
- * complete copyright information.
- */
+** utils.c -- various utility routines
+**
+** This code is Copyright (c) 2006, by the authors of nmh. See the
+** COPYRIGHT file in the root directory of the nmh distribution for
+** complete copyright information.
+*/
#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
+*/
void *
mh_xmalloc(size_t size)
{
- void *memory;
+ void *memory;
- if (size == 0)
- adios(NULL, "Tried to malloc 0 bytes");
+ if (size == 0)
+ adios(NULL, "Tried to malloc 0 bytes");
- memory = malloc(size);
- if (!memory)
- adios(NULL, "Malloc failed");
+ memory = malloc(size);
+ if (!memory)
+ adios(NULL, "Malloc failed");
- return memory;
+ return memory;
}
+/*
+** Safely call realloc
+*/
void *
mh_xrealloc(void *ptr, size_t size)
{
- void *memory;
+ 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");
+ if (size == 0)
+ adios(NULL, "Tried to realloc 0bytes");
- memory = realloc(ptr, size);
- if (!memory)
- adios(NULL, "Realloc failed");
+ memory = realloc(ptr, size);
+ if (!memory)
+ adios(NULL, "Realloc failed");
- return memory;
+ return memory;
}
+
+/*
+** Return the present working directory, if the current directory does not
+** exist, or is too long, make / the pwd.
+*/
char *
pwd(void)
{
- register char *cp;
- static char curwd[PATH_MAX];
-
- if (!getcwd (curwd, PATH_MAX)) {
- admonish (NULL, "unable to determine working directory");
- if (!mypath || !*mypath
- || (strcpy (curwd, mypath), chdir (curwd)) == -1) {
- strcpy (curwd, "/");
- chdir (curwd);
- }
- return curwd;
- }
-
- if ((cp = curwd + strlen (curwd) - 1) > curwd && *cp == '/')
- *cp = '\0';
-
- return curwd;
+ register char *cp;
+ static char curwd[PATH_MAX];
+
+ if (!getcwd(curwd, PATH_MAX)) {
+ admonish(NULL, "unable to determine working directory");
+ if (!mypath || !*mypath ||
+ (strcpy(curwd, mypath), chdir(curwd)) == -1) {
+ strcpy(curwd, "/");
+ chdir(curwd);
+ }
+ return curwd;
+ }
+
+ if ((cp = curwd + strlen(curwd) - 1) > curwd && *cp == '/') {
+ /* strip trailing slash */
+ *cp = '\0';
+ }
+
+ return curwd;
+}
+
+/*
+** add -- If "s1" is NULL, this routine just creates a
+** -- copy of "s2" into newly malloc'ed memory.
+** -- (use getcpy() instead in this case)
+** --
+** -- 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;
}