1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* util/support/k5buf.c - string buffer functions */
13  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
29  * Can't include krb5.h here, or k5-int.h which includes it, because krb5.h
33 #include "k5-platform.h"
34 #include "k5-buf.h"
43  *   space > 0
44  *   len < space
52     return (char *)buf->data + buf->len;  in endptr()
58     buf->buftype = K5BUF_ERROR;  in set_error()
59     buf->data = NULL;  in set_error()
60     buf->space = buf->len = 0;  in set_error()
74     if (buf->buftype == K5BUF_ERROR)  in ensure_space()
76     if (buf->space - buf->len >= len) /* Enough room already. */  in ensure_space()
78     if (buf->buftype == K5BUF_FIXED) /* Can't resize a fixed buffer. */  in ensure_space()
80     assert(buf->buftype == K5BUF_DYNAMIC || buf->buftype == K5BUF_DYNAMIC_ZAP);  in ensure_space()
81     new_space = buf->space * 2;  in ensure_space()
82     while (new_space - buf->len < len) {  in ensure_space()
87     if (buf->buftype == K5BUF_DYNAMIC_ZAP) {  in ensure_space()
92         memcpy(new_data, buf->data, buf->len);  in ensure_space()
93         zap(buf->data, buf->len);  in ensure_space()
94         free(buf->data);  in ensure_space()
96         new_data = realloc(buf->data, new_space);  in ensure_space()
100     buf->data = new_data;  in ensure_space()
101     buf->space = new_space;  in ensure_space()
105     if (buf->buftype == K5BUF_DYNAMIC_ZAP)  in ensure_space()
106         zap(buf->data, buf->len);  in ensure_space()
107     if (buf->buftype == K5BUF_DYNAMIC_ZAP || buf->buftype == K5BUF_DYNAMIC)  in ensure_space()
108         free(buf->data);  in ensure_space()
114 k5_buf_init_fixed(struct k5buf *buf, void *data, size_t space)  in k5_buf_init_fixed()  argument
116     assert(space > 0);  in k5_buf_init_fixed()
117     buf->buftype = K5BUF_FIXED;  in k5_buf_init_fixed()
118     buf->data = data;  in k5_buf_init_fixed()
119     buf->space = space;  in k5_buf_init_fixed()
120     buf->len = 0;  in k5_buf_init_fixed()
126     buf->buftype = K5BUF_DYNAMIC;  in k5_buf_init_dynamic()
127     buf->space = 128;  in k5_buf_init_dynamic()
128     buf->data = malloc(buf->space);  in k5_buf_init_dynamic()
129     if (buf->data == NULL) {  in k5_buf_init_dynamic()
133     buf->len = 0;  in k5_buf_init_dynamic()
140     if (buf->buftype == K5BUF_DYNAMIC)  in k5_buf_init_dynamic_zap()
141         buf->buftype = K5BUF_DYNAMIC_ZAP;  in k5_buf_init_dynamic_zap()
157     buf->len += len;  in k5_buf_add_len()
168     if (buf->buftype == K5BUF_ERROR)  in k5_buf_add_vfmt()
170     remaining = buf->space - buf->len;  in k5_buf_add_vfmt()
172     if (buf->buftype == K5BUF_FIXED) {  in k5_buf_add_vfmt()
178             buf->len += (unsigned int) r;  in k5_buf_add_vfmt()
183     assert(buf->buftype == K5BUF_DYNAMIC || buf->buftype == K5BUF_DYNAMIC_ZAP);  in k5_buf_add_vfmt()
188         buf->len += (unsigned int) r;  in k5_buf_add_vfmt()
193         /* snprintf correctly told us how much space is required. */  in k5_buf_add_vfmt()
196         remaining = buf->space - buf->len;  in k5_buf_add_vfmt()
201             buf->len += (unsigned int) r;  in k5_buf_add_vfmt()
205     /* It's a pre-C99 snprintf implementation, or something else went wrong.  in k5_buf_add_vfmt()
215         buf->len += r;  in k5_buf_add_vfmt()
217     if (buf->buftype == K5BUF_DYNAMIC_ZAP)  in k5_buf_add_vfmt()
238     return buf->data;  in k5_buf_cstring()
246     buf->len += len;  in k5_buf_get_space()
247     return endptr(buf) - len;  in k5_buf_get_space()
253     if (buf->buftype == K5BUF_ERROR)  in k5_buf_truncate()
255     assert(len <= buf->len);  in k5_buf_truncate()
256     buf->len = len;  in k5_buf_truncate()
262     return (buf->buftype == K5BUF_ERROR) ? ENOMEM : 0;  in k5_buf_status()
268     if (buf->buftype == K5BUF_ERROR)  in k5_buf_free()
270     assert(buf->buftype == K5BUF_DYNAMIC || buf->buftype == K5BUF_DYNAMIC_ZAP);  in k5_buf_free()
271     if (buf->buftype == K5BUF_DYNAMIC_ZAP)  in k5_buf_free()
272         zap(buf->data, buf->len);  in k5_buf_free()
273     free(buf->data);  in k5_buf_free()