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