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history.c
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history.c
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#include "history.h"
#include "shell.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void readHistory(struct cmdInfo *cmd_info) {
// define y reserva la memoria para las variables
cmd_info->firstCmd = (char **)malloc(sizeof(char *) * HISTORYLEN);
char line[MAX];
char **commands = cmd_info->firstCmd;
// Se abre el fichero history para leer
FILE *fd = fopen(HISTORYFILE, "r");
// si no ocurren problemas se lee línea por línea y se guardan en cmd_info
if (fd) {
int i = 0;
while (fgets(line, MAX, fd)) {
commands[i] = (char *)malloc(strlen(line + 1));
strcpy(commands[i], line);
}
cmd_info->count = i;
fclose(fd);
}
}
void writeHistory(struct cmdInfo *cmd_info) {
// Abre el ficherohostory para escribir.
// Se recorren todos los comandos guardados en cmd_info y se imprimen en
// history
char **commands = cmd_info->firstCmd;
FILE *fd = fopen(HISTORYFILE, "w");
for (int i = 0; i < cmd_info->count; i++)
fputs(commands[i], fd);
fclose(fd);
}
void updateHistory(char *cmd, struct cmdInfo *cmd_info) {
char **commands = cmd_info->firstCmd;
char *line = (char *)malloc(strlen(cmd) + 1);
strcpy(line, cmd);
// La lista de comandos que representa el history se corre en una posición y
// se agrega al final el nuevo comando
int i = cmd_info->count;
if (i == HISTORYLEN) {
int i = 1;
while (i < HISTORYLEN) {
commands[i - 1] = commands[i];
i++;
}
} else {
i++;
cmd_info->count++;
}
commands[i - 1] = line;
}
void printHistory(struct cmdInfo *cmd_info) {
// Se recorren los comandos y se imprimen en pantalla
char **commands = cmd_info->firstCmd;
for (int i = 0; i < cmd_info->count; i++) {
printf(" %d: %s", i + 1, commands[i]);
}
cmd_info->runtime_error = 1;
}
void clearHistory(struct cmdInfo *cmd_info) {
// Se libera la memoria ocupada por history
char **commands = cmd_info->firstCmd;
for (int i = 0; i < cmd_info->count; i++)
free(commands[i]);
free(cmd_info);
}