/*
*   $Id: vstring.c 558 2007-06-15 19:17:02Z elliotth $
*
*   Copyright (c) 1998-2002, Darren Hiebert
*
*   This source code is released for free distribution under the terms of the
*   GNU General Public License.
*
*   This module contains functions supporting resizeable strings.
*/

/*
*   INCLUDE FILES
*/
#include "general.h"  /* must always come first */

#include <limits.h>  /* to define INT_MAX */
#include <string.h>
#include <ctype.h>

#include "debug.h"
#include "routines.h"
#include "vstring.h"

/*
*   DATA DEFINITIONS
*/
static const size_t vStringInitialSize = 32;

/*
*   FUNCTION DEFINITIONS
*/

static void vStringResize (vString *const string, const size_t newSize)
{
    char *const newBuffer = xRealloc (string->buffer, newSize, char);

    string->size = newSize;
    string->buffer = newBuffer;
}

/*
*   External interface
*/

extern boolean vStringAutoResize (vString *const string)
{
    boolean ok = TRUE;

    if (string->size <= INT_MAX / 2)
    {
        const size_t newSize = string->size * 2;

        vStringResize (string, newSize);
    }
    return ok;
}

extern void vStringClear (vString *const string)
{
    string->length = 0;
    string->buffer [0] = '\0';
    DebugStatement ( memset (string->buffer, 0, string->size); )
}

extern void vStringDelete (vString *const string)
{
    if (string != NULL)
    {
        if (string->buffer != NULL)
            eFree (string->buffer);
        eFree (string);
    }
}

extern vString *vStringNew (void)
{
    vString *const string = xMalloc (1, vString);

    string->length = 0;
    string->size   = vStringInitialSize;
    string->buffer = xMalloc (string->size, char);

    vStringClear (string);

    return string;
}

#ifndef VSTRING_PUTC_MACRO
extern void vStringPut (vString *const string, const int c)
{
    if (string->length + 1 == string->size)  /*  check for buffer overflow */
        vStringAutoResize (string);

    string->buffer [string->length] = c;
    if (c != '\0')
        string->buffer [++string->length] = '\0';
}
#endif

extern void vStringCatS (vString *const string, const char *const s)
{
#if 1
    const size_t len = strlen (s);
    while (string->length + len + 1 >= string->size)/*  check for buffer overflow */
        vStringAutoResize (string);
    strcpy (string->buffer + string->length, s);
    string->length += len;
#else
    const char *p = s;
    do
        vStringPut (string, *p);
    while (*p++ != '\0');
#endif
}

extern vString *vStringNewCopy (const vString *const string)
{
    vString *vs = vStringNew ();
    vStringCatS (vs, string->buffer);
    return vs;
}

extern vString *vStringNewInit (const char *const s)
{
    vString *vs = vStringNew ();
    vStringCatS (vs, s);
    return vs;
}

extern void vStringNCatS (
        vString *const string, const char *const s, const size_t length)
{
    const char *p = s;
    size_t remain = length;

    while (*p != '\0'  &&  remain > 0)
    {
        vStringPut (string, *p);
        --remain;
        ++p;
    }
    vStringTerminate (string);
}

/*  Strip trailing newline from string.
 */
extern void vStringStripNewline (vString *const string)
{
    const size_t final = string->length - 1;
    if (string->buffer [final] == '\n')
    {
        string->buffer [final] = '\0';
        string->length--;
    }
}

/*  Strip leading white space from string.
 */
extern void vStringStripLeading (vString *const string)
{
    while (isspace ((int) string->buffer [0]) && string->length > 0)
    {
        size_t i;
        for (i = 1  ;  i < string->length  ;  ++i)
            string->buffer [i - 1] = string->buffer [i];
        --string->length;
        string->buffer [string->length] = '\0';
    }
}

/*  Strip trailing white space from string.
 */
extern void vStringStripTrailing (vString *const string)
{
    while (isspace ((int) string->buffer [string->length - 1]) &&
           string->length > 0)
    {
        string->length--;
        string->buffer [string->length] = '\0';
    }
}

/*  Chop last character from string.
 */
extern void vStringChop (vString *const string)
{
    if (string->length > 0)
    {
        --string->length;
        string->buffer [string->length] = '\0';
    }
}

extern void vStringCopyS (vString *const string, const char *const s)
{
    vStringClear (string);
    vStringCatS (string, s);
}

extern void vStringNCopyS (
        vString *const string, const char *const s, const size_t length)
{
    vStringClear (string);
    vStringNCatS (string, s, length);
}

extern void vStringCopyToLower (vString *const dest, const vString *const src)
{
    const size_t length = src->length;
    const char *s = src->buffer;
    char *d;
    size_t i;

    if (dest->size < src->size)
        vStringResize (dest, src->size);
    d = dest->buffer;
    for (i = 0  ;  i < length  ;  ++i)
    {
        int c = s [i];

        d [i] = tolower (c);
    }
    d [i] = '\0';
}

extern void vStringSetLength (vString *const string)
{
    string->length = strlen (string->buffer);
}

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