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Contents of /psiconv/trunk/lib/psiconv/list.h

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Revision 72 - (show annotations)
Sat Dec 23 20:21:40 2000 UTC (19 years, 6 months ago) by frodo
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(Frodo) New generation routines in generate_layout

1 /*
2 list.h - Part of psiconv, a PSION 5 file formats converter
3 Copyright (c) 1999, 2000 Frodo Looijaard <frodol@dds.nl>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
20 /* A generic list type. In C++, this would be much neater. All elements must
21 be of the same size (solve it with pointers, if needed) */
23 #ifndef PSICONV_LIST_H
24 #define PSICONV_LIST_H
26 #include <stddef.h>
27 #include <stdio.h>
29 #ifdef __cplusplus
30 extern "C" {
31 #endif /* __cplusplus */
33 /* Always use psiconv_list, never struct psiconv_list */
34 /* No need to export the actual internal format */
35 typedef struct psiconv_list_s *psiconv_list;
37 /* Before using a list, call list_new. It takes the size of a single element
38 as its argument. Always compute it with a sizeof() expression, just to be
39 safe. The returned list is empty.
40 If there is not enough memory available, NULL is returned. You should
41 always test for this explicitely, because the other functions do not
42 like a psiconv_list argument that is equal to NULL */
43 extern psiconv_list psiconv_list_new(int element_size);
45 /* This frees the list. If elements contain pointers that need to be freed
46 separately, call list_free_el below. */
47 extern void psiconv_list_free(psiconv_list l);
49 /* This calls free_el first for each element, before doing a list_free.
50 Note that you should *not* do 'free(el)' at any time; that is taken care of
51 automatically. */
52 extern void psiconv_list_free_el(psiconv_list l, void free_el(void *el));
54 /* Return the number of allocated elements */
55 extern int psiconv_list_length(const psiconv_list l);
57 /* Return 1 if the list is empty, 0 if not */
58 extern int psiconv_list_is_empty(const psiconv_list l);
60 /* Get an element from the list, and return a pointer to it. Note: you can
61 directly modify this element, but be careful not to write beyond the
62 element memory space.
63 If indx is out of range, NULL is returned. */
64 extern void * psiconv_list_get(const psiconv_list l, unsigned int indx);
66 /* Add an element at the end of the list. The element is copied from the
67 supplied element. Of course, this does not help if the element contains
68 pointers.
69 As the lists extends itself, it may be necessary to allocate new
70 memory. If this fails, a negative error-code is returned. If everything,
71 succeeds, 0 is returned. */
72 extern int psiconv_list_add(psiconv_list l, const void *el);
74 /* Do some action for each element. Note: you can directly modify the
75 elements supplied to action, and they will be changed in the list,
76 but never try a free(el)! */
77 extern void psiconv_list_foreach_el(psiconv_list l, void action(void *el));
79 /* Clone the list, that is, copy it. If elements contain pointers, you
80 should call the next routine. If not enough memory is available,
81 NULL is returned. */
82 extern psiconv_list psiconv_list_clone(const psiconv_list l);
84 /* Read upto size_t elements from file f, and put them at the end of list l.
85 Returned is the actual number of elements added. This assumes the file
86 layout and the memory layout of elements is the same. Note that if
87 not enough memory could be allocated, 0 is simply returned. */
88 extern size_t psiconv_list_fread(psiconv_list l,size_t size, FILE *f);
90 /* Concatenate two lists. The element sized does not have to be the same,
91 but the result may be quite unexpected if it is not. */
92 int psiconv_list_concat(psiconv_list l, const psiconv_list extra);
95 #ifdef __cplusplus
96 }
97 #endif /* __cplusplus */
99 #endif

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