-
/*
- * 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/nmh.h>
+#include <h/mh.h>
#include <h/utils.h>
#include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sysexits.h>
+
+/*
+** We allocate space for messages (msgs array)
+** this number of elements at a time.
+*/
+#define MAXMSGS 256
+/*
+** Safely call realloc
+*/
void *
-mh_xmalloc(size_t size)
+mh_xrealloc(void *ptr, size_t size)
{
- void *memory;
+ void *memory;
- if (size == 0)
- adios(NULL, "Tried to malloc 0 bytes");
+ /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
+ if (!ptr) {
+ return mh_xcalloc(1, size);
+ }
+ if (size == 0) {
+ adios(EX_SOFTWARE, NULL, "Tried to realloc 0 bytes");
+ }
- memory = malloc(size);
- if (!memory)
- adios(NULL, "Malloc failed");
+ memory = realloc(ptr, size);
+ if (!memory) {
+ adios(EX_OSERR, NULL, "Realloc failed");
+ }
- return memory;
+ return memory;
}
+/*
+** Safely call calloc
+*/
void *
-mh_xrealloc(void *ptr, size_t size)
+mh_xcalloc(size_t nmemb, size_t size)
+{
+ void *memory;
+
+ if (nmemb == 0 || size == 0) {
+ adios(EX_SOFTWARE, NULL, "Tried to calloc 0 bytes");
+ }
+
+ if ((memory = calloc(nmemb, size))) {
+ return memory;
+ } else {
+ adios(EX_OSERR, NULL, "calloc failed");
+ }
+}
+
+/*
+** Free a pointer and set it to NULL.
+*/
+void
+mh_free0(void * ptr)
{
- void *memory;
+ void ** p;
+ p = ptr;
+ free(*p);
+ *p = NULL;
+}
+
+/*
+** Return the present working directory, if the current directory does not
+** exist, or is too long, make / the pwd.
+*/
+char *
+pwd(void)
+{
+ 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 mh_xstrdup() 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(const char *s2, char *s1)
+{
+ char *cp;
+ size_t len1 = 0, len2 = 0;
+
+ if (s1) {
+ len1 = strlen(s1);
+ }
+ if (s2) {
+ len2 = strlen(s2);
+ }
- if (size == 0)
- adios(NULL, "Tried to realloc 0bytes");
+ cp = mh_xcalloc(len1 + len2 + 1, sizeof(char));
- memory = realloc(ptr, size);
- if (!memory)
- adios(NULL, "Realloc failed");
+ /* Copy s1 and free it */
+ if (s1) {
+ memcpy(cp, s1, len1);
+ mh_free0(&s1);
+ }
- return memory;
+ /* Copy s2 */
+ if (s2) {
+ memcpy(cp + len1, s2, len2);
+ }
+
+ /* Now NULL terminate the string */
+ cp[len1 + len2] = '\0';
+
+ return cp;
+}
+
+
+/*
+** 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(EX_IOERR, folder, "error on folder");
+ }
+ if (autocreate == 0) {
+ /* ask before creating folder */
+ cp = concat("Create folder \"", folder, "\"? ", NULL);
+ if (!getanswer(cp)) {
+ done_callback(EX_CANTCREAT);
+ }
+ mh_free0(&cp);
+ } else if (autocreate == -1) {
+ /* do not create, so exit */
+ done_callback(EX_CANTCREAT);
+ }
+ if (!makedir(folder)) {
+ adios(EX_CANTCREAT, 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(EX_SOFTWARE, 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;
+}
+
+/*
+** mh_xstrdup() is a wrapper of strdup() to replace getcpy(). It returns
+** a copy of its argument if this is nonnull; otherwise, it returns a
+** string of length 0.
+*/
+char *
+mh_xstrdup(char * s)
+{
+ char * tmp;
+ tmp = strdup(s ? s : "");
+ if (!tmp) {
+ adios(EX_OSERR, "strdup", "can't copy string");
+ }
+ return tmp;
}
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