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/* HISTORY.C (c) Copyright Volker Bandke, 2003-2009 */
/* Hercules Command History Processor */
#include "hstdinc.h"
#include "hercules.h"
#include "history.h"
#define HISTORY_MAX 10
#define CMD_SIZE 256 /* 32767 is way toooooo much */
typedef struct history {
int number;
char *cmdline;
struct history *prev;
struct history *next;
} HISTORY;
BYTE history_count; /* for line numbering */
HISTORY *history_lines; /* points to the beginning of history list (oldest command) */
HISTORY *history_lines_end; /* points to the end of history list (most recent command) */
HISTORY *history_ptr; /* points to last command retrieved by key press */
HISTORY *backup; /* used for backuping last removed command */
/* these 2 are used in panel.c to see if there was history command requested and
returns that command */
char *historyCmdLine;
int history_requested = 0;
void copy_to_historyCmdLine(char* cmdline)
{
if (historyCmdLine) free(historyCmdLine);
historyCmdLine = malloc(strlen(cmdline)+1);
strcpy(historyCmdLine, cmdline);
}
/* initialize environment */
int history_init() {
history_lines = NULL;
history_lines_end = NULL;
historyCmdLine = (char *) malloc(255);
history_requested = 0;
backup = NULL;
history_count = 0;
history_ptr = NULL;
return(0);
}
/* add commandline to history list */
int history_add(char *cmdline) {
HISTORY *tmp;
/* if there is some backup line remaining, remove it */
if (backup != NULL) {
free(backup->cmdline);
free(backup);
backup = NULL;
}
/* If last line is exactly the same as this line
ignore and return to caller */
if (history_lines != NULL && !strcmp(cmdline,history_lines_end->cmdline)) {
history_ptr = NULL;
return 0;
}
/* allocate space and copy string */
tmp = (HISTORY*) malloc(sizeof(HISTORY));
tmp->cmdline = (char*) malloc(strlen(cmdline) + 1);
strcpy(tmp->cmdline, cmdline);
tmp->next = NULL;
tmp->prev = NULL;
tmp->number = ++history_count;
if (history_lines == NULL) {
/* first in list */
history_lines = tmp;
history_lines_end = tmp;
}
else {
tmp->prev = history_lines_end;
history_lines_end->next = tmp;
history_lines_end = tmp;
}
history_ptr = NULL;
if (history_count > HISTORY_MAX) {
/* if we are over maximum number of lines in history list, oldest one should be deleted
but we don't know whether history_remove will not be called, so oldest line is backuped and not removed */
backup = history_lines;
history_lines = history_lines->next;
backup->next = NULL;
history_lines->prev = NULL;
}
return(0);
}
/* show list of lines in history */
int history_show() {
HISTORY *tmp;
tmp = history_lines;
while (tmp != NULL) {
logmsg("%4d %s\n", tmp->number, tmp->cmdline);
tmp = tmp->next;
}
return(0);
}
/* remove last line from history list (called only when history command was invoked) */
int history_remove() {
HISTORY *tmp;
if (history_lines == NULL)
return(0);
if (history_lines == history_lines_end) {
ASSERT(history_lines->next == NULL);
ASSERT(history_count == 1);
free(history_lines->cmdline);
free(history_lines);
history_lines = NULL;
history_lines_end = NULL;
history_count--;
return(0);
}
tmp = history_lines_end->prev;
tmp->next = NULL;
free(history_lines_end->cmdline);
free(history_lines_end);
history_count--;
history_lines_end = tmp;
if (backup != NULL) {
backup->next = history_lines;
history_lines->prev = backup;
history_lines = backup;
backup = NULL;
}
return(0);
}
int history_relative_line(int x) {
HISTORY *tmp = history_lines_end;
if (-x > HISTORY_MAX) {
logmsg("History limited to last %d commands\n", HISTORY_MAX);
return (-1);
}
if (-x > history_count) {
logmsg("only %d commands in history\n", history_count);
return (-1);
}
while (x<-1) {
tmp = tmp->prev;
x++;
}
copy_to_historyCmdLine(tmp->cmdline);
history_ptr = NULL;
return(0);
}
int history_absolute_line(int x) {
HISTORY *tmp = history_lines_end;
int lowlimit;
if (history_count == 0) {
logmsg("history empty\n");
return -1;
}
lowlimit = history_count - HISTORY_MAX;
if (x > history_count || x <= lowlimit) {
logmsg("only commands %d-%d are in history\n", lowlimit<0? 1 : lowlimit + 1, history_count);
return (-1);
}
while (tmp->number != x)
tmp = tmp->prev;
copy_to_historyCmdLine(tmp->cmdline);
history_ptr = NULL;
return(0);
}
int history_next() {
if (history_ptr == NULL) {
history_ptr = history_lines_end;
if (history_ptr == NULL)
return(-1);
copy_to_historyCmdLine(history_ptr->cmdline);
return(0);
}
if (history_ptr->next == NULL)
history_ptr = history_lines;
else
history_ptr = history_ptr->next;
copy_to_historyCmdLine(history_ptr->cmdline);
return(0);
}
int history_prev() {
if (history_ptr == NULL) {
history_ptr = history_lines_end;
if (history_ptr == NULL)
return(-1);
copy_to_historyCmdLine(history_ptr->cmdline);
return(0);
}
if (history_ptr->prev == NULL)
history_ptr = history_lines_end;
else
history_ptr = history_ptr->prev;
copy_to_historyCmdLine(history_ptr->cmdline);
return(0);
}
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