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#ifndef STRALLOC_H
#define STRALLOC_H
#include <sys/cdefs.h>
/* stralloc is the internal data structure all functions are working on.
* s is the string.
* len is the used length of the string.
* a is the allocated length of the string.
*/
typedef struct stralloc {
char* s;
unsigned int len;
unsigned int a;
} stralloc;
/* stralloc_ready makes sure that sa has enough space allocated to hold
* len bytes: If sa is not allocated, stralloc_ready allocates at least
* len bytes of space, and returns 1. If sa is already allocated, but
* not enough to hold len bytes, stralloc_ready allocates at least len
* bytes of space, copies the old string into the new space, frees the
* old space, and returns 1. Note that this changes sa.s. If the
* allocation fails, stralloc_ready leaves sa alone and returns 0. */
extern int stralloc_ready(stralloc* sa,unsigned int len);
/* stralloc_readyplus is like stralloc_ready except that, if sa is
* already allocated, stralloc_readyplus adds the current length of sa
* to len. */
extern int stralloc_readyplus(stralloc* sa,unsigned int len);
/* stralloc_copyb copies the string buf[0], buf[1], ..., buf[len-1] into
* sa, allocating space if necessary, and returns 1. If it runs out of
* memory, stralloc_copyb leaves sa alone and returns 0. */
extern int stralloc_copyb(stralloc* sa,const char* buf,unsigned int len);
/* stralloc_copys copies a \0-terminated string from buf into sa,
* without the \0. It is the same as
* stralloc_copyb(&sa,buf,str_len(buf)). */
extern int stralloc_copys(stralloc* sa,const char* buf);
/* stralloc_copy copies the string stored in sa2 into sa. It is the same
* as stralloc_copyb(&sa,sa2.s,sa2.len). sa2 must already be allocated. */
extern int stralloc_copy(stralloc* sa,stralloc* sa2);
/* stralloc_catb adds the string buf[0], buf[1], ... buf[len-1] to the
* end of the string stored in sa, allocating space if necessary, and
* returns 1. If sa is unallocated, stralloc_catb is the same as
* stralloc_copyb. If it runs out of memory, stralloc_catb leaves sa
* alone and returns 0. */
extern int stralloc_catb(stralloc* sa,const char* in,unsigned int len);
/* stralloc_cats is analogous to stralloc_copys */
extern int stralloc_cats(stralloc* sa,const char* in);
/* stralloc_cat is analogous to stralloc_copy */
extern int stralloc_cat(stralloc* sa,stralloc* in);
/* stralloc_append adds one byte in[0] to the end of the string stored
* in sa. It is the same as stralloc_catb(&sa,in,1). */
extern int stralloc_append(stralloc* sa,const char* in); /* beware: this takes a pointer to 1 char */
/* stralloc_starts returns 1 if the \0-terminated string in "in", without
* the terminating \0, is a prefix of the string stored in sa. Otherwise
* it returns 0. sa must already be allocated. */
extern int stralloc_starts(stralloc* sa,const char* in);
/* stralloc_0 appends \0 */
#define stralloc_0(sa) stralloc_append(sa,"")
/* stralloc_catulong0 appends a '0' padded ASCII representation of in */
extern int stralloc_catulong0(stralloc* sa,unsigned long in,unsigned int n);
/* stralloc_catlong0 appends a '0' padded ASCII representation of in */
extern int stralloc_catlong0(stralloc* sa,signed long in,unsigned int n);
/* stralloc_free frees the storage associated with sa */
extern void stralloc_free(stralloc* sa);
#define stralloc_catlong(sa,l) (stralloc_catlong0((sa),(l),0))
#define stralloc_catuint0(sa,i,n) (stralloc_catulong0((sa),(i),(n)))
#define stralloc_catint0(sa,i,n) (stralloc_catlong0((sa),(i),(n)))
#define stralloc_catint(sa,i) (stralloc_catlong0((sa),(i),0))
#endif