asmsh/history.c

#include "history.h"

char * history_filename_init(const char *homedir)
{
	const char fmt[] = "%s/.local/share/asmsh";
	char *path;
	int sz;
	int fd = open("/dev/null", O_WRONLY);
	if(!fd)
	{
		perror("Unable to open /dev/null");
		return NULL;
	}
	const char *home = homedir?homedir:getenv("HOME");
	if(!home)
	{
		dprintf(2, "No $HOME variable found\n");
		return NULL;
	}
	sz = dprintf(fd, fmt, home);
	if(sz < 0)
	{
		perror("Not able to format local share folder");
		return NULL;
	}
	
	path = alloca(sz+1);
	sprintf(path, fmt, home);
	path[sz]='\0';
	if(access(path, F_OK) < 0)
	{
		mkdir(path, 0755);
	}
	char *res = malloc(sz+strlen(ASMSH_HISTORY_FILE)+3);
	if(!res)
	{
		perror("Unable tot allocate history filename");
		return NULL;
	}
	sz = sprintf(res, "%s/%s", path, ASMSH_HISTORY_FILE);
	res[sz] = '\0';
	return res;
}


int save_history(const char *history_path, const char * const *hists)
{
	int fd = open(history_path, O_WRONLY|O_CREAT|O_TRUNC, 0744);
	if(fd < 0)
	{
		perror("Unable to open history file");
		dprintf(2, "could not save history in %s\n", history_path);
		return -1;
	}
	for(const char * const *hist=hists; *hist; hist++)
	{
		dprintf(fd, "%s\n", *hist);
	}
	close(fd);
	return 0;
}

int load_history(const char *history_path, add_history_f *add_h)
{
	if(access(history_path, F_OK) < 0) { return 0; }

	int readed, wanted;
	int fd = open(history_path, O_RDONLY);
	char buf[4096], *cur, *line;
	if(fd < 0)
	{
		perror("Unable to open history file");
		return -1;
	}

	cur = buf;
	wanted = sizeof(buf)-1;
	do
	{
		readed = read(fd, cur, wanted);
		if(readed < 0)
		{
			perror("Unable to read history file");
			close(fd);
			return -1;
		}
		cur[readed]='\0';
		for(line=cur=buf; *cur; cur++)
		{
			if(*cur=='\n')
			{
				*cur='\0';
				if(cur-line>1 && *line != '#')
				{
					add_h(line);
				}
				line = cur+1;
			}
		}
		if(*line)
		{
			wanted = sizeof(buf) - (strlen(line)+1);
			memmove(buf, line, strlen(line)+1);
		}
	}while(readed && readed == wanted);
	close(fd);
}