108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
/**
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* \file lib/stringbuf.c
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*/
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#include "system.h"
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#include "stringbuf.h"
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#include "debug.h"
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#define BUF_CHUNK 1024
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struct StringBufRec {
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/*@owned@*/ char *buf;
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/*@dependent@*/ char *tail; /* Points to first "free" char */
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int allocated;
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int free;
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};
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/**
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* Locale insensitive isspace(3).
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*/
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/*@unused@*/ static inline int xisspace(int c) {
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return (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v');
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}
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/**
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* Wrapper to free(3), hides const compilation noise, permit NULL, return NULL.
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* @param p memory to free
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* @return NULL always
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*/
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/*@unused@*/ static inline /*@null@*/ void *
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_free(/*@only@*/ /*@null@*/ const void * p) /*@modifies *p @*/
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{
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if (p != NULL) free((void *)p);
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return NULL;
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}
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StringBuf newStringBuf(void)
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{
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StringBuf sb = xmalloc(sizeof(struct StringBufRec));
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sb->free = sb->allocated = BUF_CHUNK;
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sb->buf = xcalloc(sb->allocated, sizeof(*sb->buf));
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sb->buf[0] = '\0';
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sb->tail = sb->buf;
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return sb;
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}
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StringBuf freeStringBuf(StringBuf sb)
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{
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if (sb) {
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sb->buf = _free(sb->buf);
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sb = _free(sb);
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}
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return 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 (! xisspace(*(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, const 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 = xrealloc(sb->buf, sb->allocated);
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sb->tail = sb->buf + (sb->allocated - sb->free);
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}
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/*@-mayaliasunique@*/
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strcpy(sb->tail, s);
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/*@=mayaliasunique@*/
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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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