expander_utils.c File Reference

Expansion utilities: identifies variables & handles special patterns. More...

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

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Detailed Description

Expansion utilities: identifies variables & handles special patterns.

Definition in file expander_utils.c.

Functions
int	is_dollar_quote (t_token *token)
	Check if a token is a $ connected to a quoted token. More...
int	is_var_char (char c)
	Check if a character is valid in a variable name. More...
char *	extract_var_name (char *str, int *len)
	Extract a variable name from after the $ More...
char *	append_char (char *str, char c)
	Append a single character to an allocated string. More...
char *	append_str (char *s1, char *s2)
	Concatenates 2 strings and frees the first. More...

Function Documentation

is_dollar_quote()

int is_dollar_quote

(

t_token *

token

)

Check if a token is a $ connected to a quoted token.

Detects the pattern: $"TOKEN_WORD" or $'TOKEN_WORD' + connected + next has quotes

Parameters

token

Token to inspect

Returns

1 if the pattern is valid and 0 if not

Definition at line 25 of file expander_utils.c.

References t_token::connected, t_token::next, QUOTE_NONE, and t_token::value.

Referenced by expand_all_tokens().

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is_var_char()

int is_var_char

(

char

c

)

Check if a character is valid in a variable name.

Parameters

c	Character to check

Returns

1 if alphanumeric or _ and 0 otherwise

Definition at line 40 of file expander_utils.c.

Referenced by extract_var_name(), and handle_dollar_sign().

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extract_var_name()

char* extract_var_name	(	char *	str,
		int *	len
	)

Extract a variable name from after the $

If the first char is a digit, it returns the only digit (matching BASH). Otherwise it scans for valid variable characters (alphanumeric and _)

Parameters

str	String starting after $
len	Number of characters consumed

Returns

Newly allocated variable name

Definition at line 55 of file expander_utils.c.

References is_var_char().

Referenced by process_dollar().

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append_char()

char* append_char	(	char *	str,
		char	c
	)

Append a single character to an allocated string.

Parameters

str	Original string
c	Character to append

Returns

New string with c appended or NULL on failure

Warning

original str is freed

Definition at line 79 of file expander_utils.c.

Referenced by expand_variables(), handle_dollar_sign(), and process_dollar().

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append_str()

char* append_str	(	char *	s1,
		char *	s2
	)

Concatenates 2 strings and frees the first.

If s2 is NULL it returns s1 unchanged

Parameters

s1	First string
s2	Second string

Returns

Concatenated string or NULL on failure

Definition at line 113 of file expander_utils.c.

Referenced by get_append_value(), handle_special_var(), and process_dollar().

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