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