expander.c File Reference

Variable expansion: replaces $VARIABLES and $? More...

#include "token.h"
#include "env.h"
#include "libft.h"

Include dependency graph for expander.c:

Detailed Description

Variable expansion: replaces $VARIABLES and $?

Definition in file expander.c.

Functions
static int	handle_special_var (char *str, char **result, int exit_status)
	Handle $? expansion (last exit status) More...
static int	process_dollar (char *str, int i, char **result, t_env *env_list)
	Process a normal $VARIABLE expansion. More...
static int	handle_dollar_sign (char *str, char **result, t_env *env_list, int exit_status)
	Dispatch $ expansion (special vars then normal) More...
char *	expand_variables (char *str, t_env *env_list, t_quote_type quote_type, int exit_status)
	Expand all $VARIABLE in a string. More...
int	expand_all_tokens (t_token *tokens, t_shell *shell)
	Expand all token values before parsing. More...

Function Documentation

handle_special_var()

static int handle_special_var ( char *  str, char **  result, int  exit_status  )

static

Handle $? expansion (last exit status)

Parameters

str	Input at $
result	Pointer to the result string being built
exit_status	The last exit status

Returns

2 if $? was handled (len of "$?") and 0 if not a special variable

Definition at line 25 of file expander.c.

References append_str().

Referenced by handle_dollar_sign().

Here is the call graph for this function:

Here is the caller graph for this function:

process_dollar()

static int process_dollar ( char *  str, int  i, char **  result, t_env *  env_list  )

static

Process a normal $VARIABLE expansion.

Extracts the variable name after $ and looks it up in the env list, then appends its value to result. A single $ appends a literal $

Parameters

str	Input string
i	Position of the $ character in str
result	Pointer to the result string being built
env_list	Environment list

Returns

Number of chars consumed (1 for only $ var_name_len + 1 for $VAR)

Definition at line 51 of file expander.c.

References append_char(), append_str(), extract_var_name(), and get_env_value().

Referenced by handle_dollar_sign().

Here is the call graph for this function:

Here is the caller graph for this function:

handle_dollar_sign()

static int handle_dollar_sign ( char *  str, char **  result, t_env *  env_list, int  exit_status  )

static

Dispatch $ expansion (special vars then normal)

Parameters

str	Input at the $ char
result	Pointer to the result string being built
env_list	Environment list
exit_status	Exit status for $?

Returns

Number of characters consumed from str

Definition at line 88 of file expander.c.

References append_char(), handle_special_var(), is_var_char(), and process_dollar().

Referenced by expand_variables().

Here is the call graph for this function:

Here is the caller graph for this function:

expand_variables()

char* expand_variables	(	char *	str,
		t_env *	env_list,
		t_quote_type	quote_type,
		int	exit_status
	)

Expand all $VARIABLE in a string.

Parameters

str	Input string
env_list	Environment list for the variables lookups
quote_type	Quote context (QUOTE_SINGLE = no expansion)
exit_status	Last exit status for $? expansion

Returns

Newly allocated expanded string or NULL

Definition at line 111 of file expander.c.

References append_char(), handle_dollar_sign(), and QUOTE_SINGLE.

Referenced by expand_full(), and write_heredoc_line().

Here is the call graph for this function:

Here is the caller graph for this function:

expand_all_tokens()

int expand_all_tokens	(	t_token *	tokens,
		t_shell *	shell
	)

Expand all token values before parsing.

• Walks the token list and expands each TOKEN_WORD
• Single quoted tokens and heredoc delimiters (token after <<) are not exp
• A bare $ connected to a quoted token is replaced with an empty string

Parameters

tokens	Token list head
shell	Shell state

Returns

0 on success and -1 on allocation failure

Warning

On -1 the token list could be partially expanded

Definition at line 150 of file expander.c.

References t_shell::env, t_shell::exit_status, expand_full(), is_dollar_quote(), t_token::next, QUOTE_SINGLE, t_token::quote_type, TOKEN_HEREDOC, TOKEN_WORD, t_token::type, and t_token::value.

Referenced by process_input(), and process_ui_input().

Here is the call graph for this function:

Here is the caller graph for this function:

Go to the source code of this file.