80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
#include <stdlib.h>
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#include <ctype.h>
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#include "stringbuf.h"
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#define BUF_CHUNK 1024
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struct StringBufRec {
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char *buf;
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char *tail; /* Points to first "free" char (usually '\0') */
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int allocated;
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int free;
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};
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StringBuf newStringBuf(void)
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{
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StringBuf sb = malloc(sizeof(struct StringBufRec));
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sb->buf = malloc(BUF_CHUNK * sizeof(char));
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sb->buf[0] = '\0';
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sb->tail = sb->buf;
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sb->allocated = BUF_CHUNK;
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sb->free = BUF_CHUNK;
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return sb;
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}
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void freeStringBuf(StringBuf sb)
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{
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free(sb->buf);
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free(sb);
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}
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void truncStringBuf(StringBuf sb)
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{
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sb->buf[0] = '\0';
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sb->tail = sb->buf;
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sb->free = sb->allocated;
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}
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void stripTrailingBlanksStringBuf(StringBuf sb)
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{
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while (sb->free != sb->allocated) {
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if (! isspace(*(sb->tail - 1))) {
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break;
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}
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sb->free++;
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sb->tail--;
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}
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sb->tail[0] = '\0';
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}
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char *getStringBuf(StringBuf sb)
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{
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return sb->buf;
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}
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void appendStringBufAux(StringBuf sb, char *s, int nl)
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{
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int l;
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l = strlen(s);
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/* If free == l there is no room for NULL terminator! */
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while ((l + nl + 1) > sb->free) {
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sb->allocated += BUF_CHUNK;
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sb->free += BUF_CHUNK;
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sb->buf = realloc(sb->buf, sb->allocated);
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sb->tail = sb->buf + (sb->allocated - sb->free);
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}
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strcpy(sb->tail, s);
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sb->tail += l;
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sb->free -= l;
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if (nl) {
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sb->tail[0] = '\n';
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sb->tail[1] = '\0';
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sb->tail++;
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sb->free--;
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}
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}
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