ISC DHCP  4.3.5
A reference DHCPv4 and DHCPv6 implementation
array.c
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1 /* listener.c
2 
3  Subroutines that support the omapi extensible array type. */
4 
5 /*
6  * Copyright (c) 2004-2007,2009,2014 by Internet Systems Consortium, Inc. ("ISC")
7  * Copyright (c) 2001-2003 by Internet Software Consortium
8  *
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27  */
28 
29 #include "dhcpd.h"
30 
31 #include <omapip/omapip_p.h>
32 
33 /* Allocate a new extensible array. */
34 
35 isc_result_t omapi_array_allocate (omapi_array_t **array,
37  omapi_array_deref_t deref,
38  const char *file, int line)
39 {
40  omapi_array_t *aptr;
41 
42  if (!array || *array)
43  return DHCP_R_INVALIDARG;
44  aptr = dmalloc (sizeof (omapi_array_t),file, line);
45  if (!aptr)
46  return ISC_R_NOMEMORY;
47  *array = aptr;
48  aptr -> ref = ref;
49  aptr -> deref = deref;
50  return ISC_R_SUCCESS;
51 }
52 
53 isc_result_t omapi_array_free (omapi_array_t **array,
54  const char *file, int line)
55 {
56  omapi_array_t *aptr;
57  int i;
58 
59  if (!array || !*array)
60  return DHCP_R_INVALIDARG;
61  aptr = *array;
62  for (i = 0; i < aptr -> count; i++)
63  if (aptr -> data [i] && aptr -> deref)
64  (*aptr -> deref) (&aptr -> data [i], file, line);
65  dfree (aptr -> data, MDL);
66  dfree (aptr, MDL);
67  *array = (omapi_array_t *)0;
68  return ISC_R_SUCCESS;
69 }
70 
71 /* Extend the size of the array by one entry (we may allocate more than that)
72  and store the specified value in the new array element. */
73 
74 isc_result_t omapi_array_extend (omapi_array_t *array, char *ptr,
75  int *index, const char *file, int line)
76 {
77  isc_result_t status;
78  int new = array -> count;
79  status = omapi_array_set (array, ptr, new, file, line);
80  if (index && status == ISC_R_SUCCESS)
81  *index = new;
82  return status;
83 }
84 
85 /* Set a value in the specified array, extending it if necessary. */
86 
87 isc_result_t omapi_array_set (omapi_array_t *array, void *ptr, int index,
88  const char *file, int line)
89 {
90  char **newbuf;
91  int delta;
92  isc_result_t status;
93 
94  if (!array)
95  return DHCP_R_INVALIDARG;
96  if (!ptr)
97  return DHCP_R_INVALIDARG;
98  if (index < 0)
99  return DHCP_R_INVALIDARG;
100 
101  /* If the proposed index is larger than the current available
102  space in the array, make more space in the array. */
103  if (array -> max <= index) {
104  delta = index - array -> max + 10;
105  newbuf = dmalloc ((array -> max + delta) * sizeof (char *),
106  file, line);
107  if (!newbuf)
108  return ISC_R_NOMEMORY;
109  /* Zero the new elements. */
110  memset (&newbuf [array -> max], 0, (sizeof (char *)) * delta);
111  array -> max += delta;
112  /* Copy the old array data into the new buffer. */
113  if (array -> data) {
114  memcpy (newbuf,
115  array -> data, array -> count * sizeof (char *));
116  dfree (array -> data, file, line);
117  }
118  array -> data = newbuf;
119  } else {
120  /* If there's already data there, and this is an array
121  of references, dereference what's there. */
122  if (array -> data [index]) {
123  status = ((*array -> deref) (&array -> data [index],
124  file, line));
125 
126  if (status != ISC_R_SUCCESS)
127  return status;
128  }
129  }
130 
131  /* Store the pointer using the referencer function. We have
132  either just memset this to zero or dereferenced what was
133  there previously, so there is no need to do anything if the
134  pointer we have been asked to store is null. */
135  if (ptr) {
136  status = (*array -> ref) (&array -> data [index], ptr,
137  file, line);
138  if (status != ISC_R_SUCCESS)
139  return status;
140  }
141  if (index >= array -> count)
142  array -> count = index + 1;
143  return ISC_R_SUCCESS;
144 }
145 
146 isc_result_t omapi_array_lookup (char **ptr, omapi_array_t *array, int index,
147  const char *file, int line)
148 {
149  if (!array || !ptr || *ptr || index < 0 || index >= array -> count)
150  return DHCP_R_INVALIDARG;
151  if (array -> data [index])
152  return (*array -> ref) (ptr,
153  array -> data [index], file, line);
154  return ISC_R_NOTFOUND;
155 }
156 
const char int line
Definition: dhcpd.h:3723
isc_result_t(* omapi_array_deref_t)(char **, const char *, int)
Definition: omapip.h:187
isc_result_t omapi_array_free(omapi_array_t **array, const char *file, int line)
Definition: array.c:53
#define MDL
Definition: omapip.h:568
isc_result_t omapi_array_set(omapi_array_t *array, void *ptr, int index, const char *file, int line)
Definition: array.c:87
#define DHCP_R_INVALIDARG
Definition: result.h:48
isc_result_t omapi_array_lookup(char **ptr, omapi_array_t *array, int index, const char *file, int line)
Definition: array.c:146
isc_result_t omapi_array_extend(omapi_array_t *array, char *ptr, int *index, const char *file, int line)
Definition: array.c:74
int index
Definition: tree.h:340
void dfree(void *, const char *, int)
Definition: alloc.c:131
void * dmalloc(size_t, const char *, int)
Definition: alloc.c:56
isc_result_t omapi_array_allocate(omapi_array_t **array, omapi_array_ref_t ref, omapi_array_deref_t deref, const char *file, int line)
Definition: array.c:35
const char * file
Definition: dhcpd.h:3723
isc_result_t(* omapi_array_ref_t)(char **, char *, const char *, int)
Definition: omapip.h:186