Annotation of libwww/Library/src/HTChunk.c, revision 2.19
2.10 frystyk 1: /* HTChunk.c
2: ** CHUNK HANDLING: FLEXIBLE ARRAYS
3: **
2.13 frystyk 4: ** (c) COPYRIGHT MIT 1995.
2.10 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
1.1 timbl 6: **
2.6 frystyk 7: ** history: AL, HF 28 Apr 94, Now chunk->data is filled by '\0' so
8: ** that the string is terminated at any time. That makes
2.15 frystyk 9: ** HTChunk_terminate not needed any more, but never mind.
2.6 frystyk 10: **
1.1 timbl 11: */
12:
2.12 frystyk 13: /* Library include files */
2.19 ! frystyk 14: #include "sysdep.h"
1.1 timbl 15: #include "HTUtils.h"
2.12 frystyk 16: #include "HTChunk.h" /* Implemented here */
1.1 timbl 17:
18: /* Create a chunk with a certain allocation unit
19: ** --------------
20: */
2.15 frystyk 21: PUBLIC HTChunk * HTChunk_new (int grow)
1.1 timbl 22: {
2.18 frystyk 23: HTChunk * ch;
24: if ((ch = (HTChunk *) HT_CALLOC(1, sizeof(HTChunk))) == NULL)
25: HT_OUTOFMEM("HTChunk_new");
1.1 timbl 26: ch->growby = grow;
27: return ch;
28: }
29:
30:
31: /* Clear a chunk of all data
32: ** --------------------------
2.19 ! frystyk 33: ** Zero the space but do NOT HT_FREE it. We zero because we promise to have
2.17 frystyk 34: ** a NUL terminated string at all times.
1.1 timbl 35: */
2.15 frystyk 36: PUBLIC void HTChunk_clear (HTChunk * ch)
1.1 timbl 37: {
2.16 frystyk 38: if (ch) {
39: ch->size = 0;
40: memset((void *) ch->data, '\0', ch->allocated);
1.1 timbl 41: }
42: }
43:
44:
45: /* Free a chunk
46: ** ------------
47: */
2.15 frystyk 48: PUBLIC void HTChunk_delete (HTChunk * ch)
1.1 timbl 49: {
2.16 frystyk 50: if (ch) {
2.18 frystyk 51: HT_FREE(ch->data);
52: HT_FREE(ch);
2.16 frystyk 53: }
1.1 timbl 54: }
55:
56:
57: /* Append a character
58: ** ------------------
59: */
2.15 frystyk 60: PUBLIC void HTChunk_putc (HTChunk * ch, char c)
1.1 timbl 61: {
2.17 frystyk 62: if (ch) {
63: if (ch->size >= ch->allocated-1) {
64: if (ch->data) {
2.18 frystyk 65: if ((ch->data = (char *) HT_REALLOC(ch->data,ch->allocated+ch->growby)) == NULL)
66: HT_OUTOFMEM("HTChunk_putc");
2.17 frystyk 67: memset((void *) (ch->data + ch->allocated), '\0', ch->growby);
68: } else {
2.18 frystyk 69: if ((ch->data = (char *) HT_CALLOC(1, ch->allocated+ch->growby)) == NULL)
70: HT_OUTOFMEM("HTChunk_putc");
2.17 frystyk 71: }
72: ch->allocated += ch->growby;
2.6 frystyk 73: }
2.17 frystyk 74: *(ch->data+ch->size++) = c;
1.1 timbl 75: }
2.16 frystyk 76: }
77:
78: /* Append a string
79: ** ---------------
80: */
2.19 ! frystyk 81: PUBLIC void HTChunk_puts (HTChunk * ch, const char * s)
2.16 frystyk 82: {
83: HTChunk_putb(ch, s, (int) strlen(s));
84: }
85:
86: /* Append a block
87: ** ---------------
88: ** The string is always zero terminated
89: */
2.19 ! frystyk 90: PUBLIC void HTChunk_putb (HTChunk * ch, const char * block, int len)
2.16 frystyk 91: {
92: if (ch && block && len) {
93: int needed = ch->size+len;
94: if (needed >= ch->allocated) {
95: ch->allocated = needed - needed%ch->growby + ch->growby;
96: if (ch->data) {
2.18 frystyk 97: if ((ch->data = (char *) HT_REALLOC(ch->data, ch->allocated)) == NULL)
98: HT_OUTOFMEM("HTChunk_putb");
2.16 frystyk 99: memset((void *) (ch->data + needed), '\0', ch->allocated-needed);
100: } else {
2.18 frystyk 101: if ((ch->data = (char *) HT_CALLOC(1, ch->allocated)) == NULL)
102: HT_OUTOFMEM("HTChunk_putb");
2.16 frystyk 103: }
104: }
105: memcpy((void *) (ch->data+ch->size), block, len);
106: ch->size = needed;
107: }
1.1 timbl 108: }
109:
110:
111: /* Ensure a certain size
112: ** ---------------------
113: */
2.16 frystyk 114: PUBLIC void HTChunk_ensure (HTChunk * ch, int len)
1.1 timbl 115: {
2.16 frystyk 116: if (ch && len) {
117: int needed = ch->size+len;
118: if (needed >= ch->allocated) {
119: ch->allocated = needed - needed%ch->growby + ch->growby;
120: if (ch->data) {
2.18 frystyk 121: if ((ch->data = (char *) HT_REALLOC(ch->data, ch->allocated)) == NULL)
122: HT_OUTOFMEM("HTChunk_putb");
2.16 frystyk 123: memset((void *) (ch->data + ch->size), '\0', ch->allocated-ch->size);
124: } else {
2.18 frystyk 125: if ((ch->data = (char *) HT_CALLOC(1, ch->allocated)) == NULL)
126: HT_OUTOFMEM("ch->data ");
2.16 frystyk 127: }
128: }
129: }
130: #if 0
1.1 timbl 131: if (needed <= ch->allocated) return;
132: ch->allocated = needed-1 - ((needed-1) % ch->growby)
133: + ch->growby; /* Round up */
134: ch->data = ch->data ? (char *)realloc(ch->data, ch->allocated)
2.19 ! frystyk 135: : (char *)HT_MALLOC(ch->allocated);
! 136: if (ch->data == NULL) HT_OUTOFMEM(__FILE__, "HTChunk_ensure");
2.16 frystyk 137: #endif
1.1 timbl 138: }
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