diplodocus.org Git - nmh/blob - sbr/utils.c

   1
   2 /*
   3  * utils.c -- various utility routines
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2006, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13 #include <h/utils.h>
  14 #include <stdlib.h>
  15 #include <errno.h>
  16
  17 /*
  18  * We allocate space for messages (msgs array)
  19  * this number of elements at a time.
  20  */
  21 #define MAXMSGS 256
  22
  23 /*
  24  * Safely call malloc
  25  */
  26 void *
  27 mh_xmalloc(size_t size)
  28 {
  29     void *memory;
  30
  31     if (size == 0)
  32         adios(NULL, "Tried to malloc 0 bytes");
  33
  34     memory = malloc(size);
  35     if (!memory)
  36         adios(NULL, "Malloc failed");
  37
  38     return memory;
  39 }
  40
  41 /*
  42  * Safely call realloc
  43  */
  44 void *
  45 mh_xrealloc(void *ptr, size_t size)
  46 {
  47     void *memory;
  48
  49     if (size == 0)
  50         adios(NULL, "Tried to realloc 0bytes");
  51
  52     memory = realloc(ptr, size);
  53     if (!memory)
  54         adios(NULL, "Realloc failed");
  55
  56     return memory;
  57 }
  58
  59 /*
  60  * Return the present working directory, if the current directory does not
  61  * exist, or is too long, make / the pwd.
  62  */
  63 char *
  64 pwd(void)
  65 {
  66     register char *cp;
  67     static char curwd[PATH_MAX];
  68
  69     if (!getcwd (curwd, PATH_MAX)) {
  70         admonish (NULL, "unable to determine working directory");
  71         if (!mypath || !*mypath
  72                 || (strcpy (curwd, mypath), chdir (curwd)) == -1) {
  73             strcpy (curwd, "/");
  74             chdir (curwd);
  75         }
  76         return curwd;
  77     }
  78
  79     if ((cp = curwd + strlen (curwd) - 1) > curwd && *cp == '/')
  80         *cp = '\0';
  81
  82     return curwd;
  83 }
  84
  85 /*
  86  * add   -- If "s1" is NULL, this routine just creates a
  87  *       -- copy of "s2" into newly malloc'ed memory.
  88  *       --
  89  *       -- If "s1" is not NULL, then copy the concatenation
  90  *       -- of "s1" and "s2" (note the order) into newly
  91  *       -- malloc'ed memory.  Then free "s1".
  92  */
  93 char *
  94 add (char *s2, char *s1)
  95 {
  96     char *cp;
  97     size_t len1 = 0, len2 = 0;
  98
  99     if (s1)
 100         len1 = strlen (s1);
 101     if (s2)
 102         len2 = strlen (s2);
 103
 104     cp = mh_xmalloc (len1 + len2 + 1);
 105
 106     /* Copy s1 and free it */
 107     if (s1) {
 108         memcpy (cp, s1, len1);
 109         free (s1);
 110     }
 111
 112     /* Copy s2 */
 113     if (s2)
 114         memcpy (cp + len1, s2, len2);
 115
 116     /* Now NULL terminate the string */
 117     cp[len1 + len2] = '\0';
 118
 119     return cp;
 120 }
 121
 122 /*
 123  * create_folder
 124  *      Check to see if a folder exists, if not, prompt the user to create
 125  *      it.
 126  */
 127 void create_folder(char *folder, int autocreate, void (*done_callback)())
 128 {
 129     struct stat st;
 130     extern int errno;
 131     char *cp;
 132
 133     if (stat (folder, &st) == -1) {
 134         if (errno != ENOENT)
 135             adios (folder, "error on folder");
 136         if (autocreate == 0) {
 137             /* ask before creating folder */
 138             cp = concat ("Create folder \"", folder, "\"? ", NULL);
 139             if (!getanswer (cp))
 140                 done_callback (1);
 141             free (cp);
 142         } else if (autocreate == -1) {
 143             /* do not create, so exit */
 144             done_callback (1);
 145         }
 146         if (!makedir (folder))
 147             adios (NULL, "unable to create folder %s", folder);
 148     }
 149 }
 150
 151 /*
 152  * num_digits
 153  *      Return the number of digits in a nonnegative integer.
 154  */
 155 int
 156 num_digits (int n)
 157 {
 158     int ndigits = 0;
 159
 160     /* Sanity check */
 161     if (n < 0)
 162         adios (NULL, "oops, num_digits called with negative value");
 163
 164     if (n == 0)
 165         return 1;
 166
 167     while (n) {
 168         n /= 10;
 169         ndigits++;
 170     }
 171
 172     return ndigits;
 173 }
 174
 175 /*
 176  * Append a message arg to an array of them, resizing it if necessary.
 177  * The function is written to suit the arg parsing code it was extracted
 178  * from, and will probably be changed when the other code is cleaned up.
 179  */
 180 void
 181 app_msgarg(struct msgs_array *msgs, char *cp)
 182 {
 183         if(msgs->size >= msgs->max)
 184                 msgs->msgs = mh_xrealloc(msgs->msgs, (msgs->max+=MAXMSGS)*sizeof(*msgs->msgs));
 185         msgs->msgs[msgs->size++] = cp;
 186 }