gno/lib/libcontrib/strarray.c

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1997-10-03 04:49:40 +00:00
/*
* String Array implementation. These routines dynamically handle an
* array of NULL-terminated strings. The array itself is also NULL-
* terminated.
*
* Devin Reade, September 1997.
*
* $Id: strarray.c,v 1.1 1997/10/03 04:49:40 gdr Exp $
*/
#include <string.h>
#include <stdlib.h>
#include <err.h>
#include <contrib.h>
#define SLOTS_QUANTUM 64
/*
* LC_StringArrayNew
*
* Creates and returns a new, empty string array. The vector will be
* allocated, but will have NULL as the first element.
*/
LC_StringArray_t
LC_StringArrayNew (void) {
LC_StringArray_t result;
result = LC_xmalloc(sizeof(LC_StringArrayElem_t));
result->lc_vec = LC_xmalloc(SLOTS_QUANTUM * sizeof(char *));
(result->lc_vec)[0] = NULL;
result->lc_alloced = SLOTS_QUANTUM;
result->lc_used = 0;
return result;
}
/*
* LC_StringArrayAdd
*
* Adds a string <str> to the stringArray <array>. Calling this
* with <str>==NULL has no effect as the array is always NULL-terminated.
*/
void
LC_StringArrayAdd (LC_StringArray_t array, char *str) {
if (array == NULL) {
errx(1, "LC_StringArrayAdd was passed a NULL first argument");
}
if (array->lc_used > array->lc_alloced) {
errx(1, "LC_StringArrayAdd: corrupted string array");
}
if (str == NULL) {
return;
}
/* grow the size of the string array, if necessary */
if (array->lc_alloced - array->lc_used < 2) {
array->lc_alloced+=SLOTS_QUANTUM;
if (array->lc_vec == NULL) {
array->lc_vec = LC_xmalloc(array->lc_alloced * sizeof(char *));
} else {
array->lc_vec = LC_xrealloc(array->lc_vec,
array->lc_alloced * sizeof(char *));
}
}
/* add in the string */
array->lc_vec[array->lc_used] = LC_xstrdup(str);
array->lc_used++;
array->lc_vec[array->lc_used] = NULL;
return;
}
#if 0
/*
* This routine has been disabled for now because it is subject to
* buffer overflow.
*/
/*
* LC_StringArrayAdd2
*
* This is like LC_StringArrayAdd, but instead of taking one string,
* it takes printf()-like arguments
*/
void
LC_StringArrayAdd2 (LC_StringArray_t array, char *format, ...) {
va_list ap;
va_start(ap,format);
vsprintf(buffer,format,ap);
LC_StringArrayAdd(array,buffer);
va_end(ap);
return;
}
#endif
void
LC_StringArrayDelete (LC_StringArray_t array, char *str) {
int i;
for (i=0; i<array->lc_used; i++) {
if (strcmp(array->lc_vec[i],str)) continue;
/* found it; free up the memory */
free(array->lc_vec[i]);
for (; i<array->lc_used; i++) {
array->lc_vec[i]=array->lc_vec[i+1];
}
break;
}
array->lc_used -= 1;
}
/*
* LC_StringArrayClear -- free the memory allocated by LC_StringArrayAdd()
* and reinitialize the associated variables.
*/
void
LC_StringArrayClear (LC_StringArray_t array) {
int i;
if (array->lc_used == 0) {
return;
}
if ((array->lc_vec == 0) || (array->lc_alloced == 0)) {
errx(1, "LC_StringArrayClear: corrupted array");
}
for (i=0; i<array->lc_used; i++) {
free((array->lc_vec)[i]);
}
free(array->lc_vec);
array->lc_vec = NULL;
array->lc_alloced = 0;
array->lc_used = 0;
return;
}
/*
* LC_StringArrayCat
*
* Concatenate the elements of a LC_StringArray_t into a single character
* string. Return a pointer to the malloc'd string. The LC_StringArray_t
* is not modified.
*/
char *
LC_StringArrayCat (LC_StringArray_t array, int insertSpace) {
int i, j;
size_t len, len2;
char *result, *p, *q, **qq;
len = 1;
j = (insertSpace) ? 1 : 0;
for (i=0; i<array->lc_used; i++) {
len += strlen((array->lc_vec)[i]) + j;
}
result = LC_xmalloc(len * sizeof(char));
*p = *result = '\0';
j = array->lc_used;
qq = array->lc_vec;
for (i=0; i<j; i++) {
#if 1
q = qq[i];
len2 = strlen(q);
strcpy(p, q);
p += len2;
if (insertSpace) {
*p++ = ' ';
*p = '\0';
}
#else
strcat(result,(array->lc_vec)[i]);
if (insertSpace) {
strcat(result," ");
}
#endif
}
if (len > 1) {
/* dump the extra space at the end of the string */
result[len-1]='\0';
}
return result;
}