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MPSL C API

This reference documents version 2.2.0 of the C API.

By Source

mpsl.y

• mpsl_compile
• mpsl_compile_file
• mpsl_eval

mpsl_c.c

• mpsl_argv
• mpsl_boolean
• mpsl_error
• mpsl_get_symbol
• mpsl_is_true
• mpsl_set_symbol
• mpsl_shutdown
• mpsl_startup
• mpsl_trap

Alphabetical

• mpsl_argv - Fills the ARGV global array.
• mpsl_boolean - Returns 'true' or 'false' MPSL stock values.
• mpsl_compile - Compiles a string of MPSL code.
• mpsl_compile_file - Compiles a file of MPSL code.
• mpsl_error - Generates an error.
• mpsl_eval - Evaluates MSPL code.
• mpsl_get_symbol - Gets the value of a symbol.
• mpsl_is_true - Tests if a value is true.
• mpsl_set_symbol - Sets value to a symbol.
• mpsl_shutdown - Shuts down MPSL.
• mpsl_startup - Initializes MPSL.
• mpsl_trap - Install a trapping function.

mpsl_argv

Name

mpsl_argv - Fills the ARGV global array.

Synopsis

 void mpsl_argv(int argc, char *argv[]);

Arguments

argc

number of arguments

argv

array of string values

Description

Fills the ARGV global MPSL array with an array of arguments. These are usually the ones sent to main().

mpsl_boolean

Name

mpsl_boolean - Returns 'true' or 'false' MPSL stock values.

Synopsis

 mpdm_t mpsl_boolean(int b);

Arguments

b

boolean selector

Description

Returns MPSL's 'false' or 'true' values depending on the value in b.

mpsl_compile

Name

mpsl_compile - Compiles a string of MPSL code.

Synopsis

 mpdm_t mpsl_compile(mpdm_t code);

Arguments

code

A value containing a string of MPSL code

Description

Compiles a string of MPSL code and returns an mpdm value executable by mpdm_exec(). If there is a syntax (or other type) error, NULL is returned instead.

mpsl_compile_file

Name

mpsl_compile_file - Compiles a file of MPSL code.

Synopsis

 mpdm_t mpsl_compile_file(mpdm_t file, mpdm_t inc);

Arguments

file

File stream or file name.

inc

search path for source files.

Description

Compiles a source file of MPSL code and returns an mpdm value executable by mpdm_exec(). If file is an MPSL file descriptor, it's read as is and compiled; otherwise, it's assumed to be a file name, that will be searched for in any of the paths defined in the inc array. If the file cannot be found or there is any other error, NULL is returned instead.

mpsl_error

Name

mpsl_error - Generates an error.

Synopsis

 mpdm_t mpsl_error(mpdm_t err);

Arguments

err

the error message

Description

Generates an error. The err error message is stored in the ERROR mpsl variable and the mpsl_abort global flag is set, so no further mpsl code can be executed until reset.

mpsl_eval

Name

mpsl_eval - Evaluates MSPL code.

Synopsis

 mpdm_t mpsl_eval(mpdm_t code, mpdm_t args, mpdm_t ctxt);

Arguments

code

A value containing a string of MPSL code, or executable code

args

optional arguments for @code

ctxt

context for @code

Description

Evaluates a piece of code. The code can be a string containing MPSL source code (that will be compiled) or a direct executable value. If the compilation or the execution gives an error, the ERROR variable will be set to a printable value and NULL returned. Otherwise, the exit value from the code is returned and ERROR set to NULL. The abort flag is reset on exit.

mpsl_get_symbol

Name

mpsl_get_symbol - Gets the value of a symbol.

Synopsis

 mpdm_t mpsl_get_symbol(mpdm_t s, mpdm_t l);

Arguments

s

symbol name

l

local symbol table

Description

Gets the value of a symbol. The symbol can be local or global (if the symbol exists in both tables, the local value will be returned).

mpsl_is_true

Name

mpsl_is_true - Tests if a value is true.

Synopsis

 int mpsl_is_true(mpdm_t v);

Arguments

v

the value

Description

If v is a valid MPSL 'false' value (NULL, "" or the "0" string), returns zero, or nonzero otherwise.

mpsl_set_symbol

Name

mpsl_set_symbol - Sets value to a symbol.

Synopsis

 mpdm_t mpsl_set_symbol(mpdm_t s, mpdm_t v, mpdm_t l);

Arguments

s

symbol name

v

value

l

local symbol table

Description

Assigns the value v to the s symbol. If the value exists as a local symbol, it's assigned to it; otherwise, it's set as a global symbol (and created if it does not exist).

mpsl_shutdown

Name

mpsl_shutdown - Shuts down MPSL.

Synopsis

 void mpsl_shutdown(void);

Description

Shuts down MPSL. No MPSL functions should be used from now on.

mpsl_startup

Name

mpsl_startup - Initializes MPSL.

Synopsis

 int mpsl_startup(void);

Description

Initializes the Minimum Profit Scripting Language. Returns 0 if everything went OK.

mpsl_trap

Name

mpsl_trap - Install a trapping function.

Synopsis

 mpdm_t mpsl_trap(mpdm_t trap_func);

Arguments

trap_func

The trapping MPSL code

Description

Installs a trapping function. The function is an MPSL executable value receiving 3 arguments: the code stream, the arguments and the return value of the executed code.

Returns NULL (previous versions returned the previous trapping function).