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alias_builtins.c
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alias_builtins.c
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#include "shell.h"
int shellby_alias(char **args, char __attribute__((__unused__)) **front);
void set_alias(char *var_name, char *value);
void print_alias(alias_t *alias);
/**
* shellby_alias - Builtin command that either prints all aliases, specific
* aliases, or sets an alias.
* @args: An array of arguments.
* @front: A double pointer to the beginning of args.
*
* Return: If an error occurs - -1.
* Otherwise - 0.
*/
int shellby_alias(char **args, char __attribute__((__unused__)) **front)
{
alias_t *temp = aliases;
int i, ret = 0;
char *value;
if (!args[0])
{
while (temp)
{
print_alias(temp);
temp = temp->next;
}
return (ret);
}
for (i = 0; args[i]; i++)
{
temp = aliases;
value = _strchr(args[i], '=');
if (!value)
{
while (temp)
{
if (_strcmp(args[i], temp->name) == 0)
{
print_alias(temp);
break;
}
temp = temp->next;
}
if (!temp)
ret = create_error(args + i, 1);
}
else
set_alias(args[i], value);
}
return (ret);
}
/**
* set_alias - Will either set an existing alias 'name' with a new value,
* 'value' or creates a new alias with 'name' and 'value'.
* @var_name: Name of the alias.
* @value: Value of the alias. First character is a '='.
*/
void set_alias(char *var_name, char *value)
{
alias_t *temp = aliases;
int len, j, k;
char *new_value;
*value = '\0';
value++;
len = _strlen(value) - _strspn(value, "'\"");
new_value = malloc(sizeof(char) * (len + 1));
if (!new_value)
return;
for (j = 0, k = 0; value[j]; j++)
{
if (value[j] != '\'' && value[j] != '"')
new_value[k++] = value[j];
}
new_value[k] = '\0';
while (temp)
{
if (_strcmp(var_name, temp->name) == 0)
{
free(temp->value);
temp->value = new_value;
break;
}
temp = temp->next;
}
if (!temp)
add_alias_end(&aliases, var_name, new_value);
}
/**
* print_alias - Prints the alias in the format name='value'.
* @alias: Pointer to an alias.
*/
void print_alias(alias_t *alias)
{
char *alias_string;
int len = _strlen(alias->name) + _strlen(alias->value) + 4;
alias_string = malloc(sizeof(char) * (len + 1));
if (!alias_string)
return;
_strcpy(alias_string, alias->name);
_strcat(alias_string, "='");
_strcat(alias_string, alias->value);
_strcat(alias_string, "'\n");
write(STDOUT_FILENO, alias_string, len);
free(alias_string);
}
/**
* replace_aliases - Goes through the arguments and replace any matching alias
* with their value.
* @args: 2D pointer to the arguments.
*
* Return: 2D pointer to the arguments.
*/
char **replace_aliases(char **args)
{
alias_t *temp;
int i;
char *new_value;
if (_strcmp(args[0], "alias") == 0)
return (args);
for (i = 0; args[i]; i++)
{
temp = aliases;
while (temp)
{
if (_strcmp(args[i], temp->name) == 0)
{
new_value = malloc(sizeof(char) * (_strlen(temp->value) + 1));
if (!new_value)
{
free_args(args, args);
return (NULL);
}
_strcpy(new_value, temp->value);
free(args[i]);
args[i] = new_value;
i--;
break;
}
temp = temp->next;
}
}
return (args);
}