62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
#include "etherboot.h"
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#include "errno.h"
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#include "vsprintf.h"
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/** @file
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*
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* Error codes and descriptions.
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*
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* This file provides the global variable #errno and the function
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* strerror(). These function much like their standard C library
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* equivalents.
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*
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* The error numbers used by Etherboot are a superset of those defined
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* by the PXE specification version 2.1. See errno.h for a listing of
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* the error values.
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*
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* To save space in ROM images, error string tables are optional. Use
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* the ERRORMSG_XXX options in config.h to select which error string
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* tables you want to include. If an error string table is omitted,
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* strerror() will simply return the text "Error 0x<errno>".
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*
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*/
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/**
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* Global "last error" number.
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*
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* This is valid only when a function has just returned indicating a
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* failure.
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*
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*/
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int errno;
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static struct errortab errortab_start[0] __table_start(errortab);
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static struct errortab errortab_end[0] __table_end(errortab);
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/**
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* Retrieve string representation of error number.
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*
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* @v errno Error number
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* @ret strerror Pointer to error text
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*
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* If the error is not found in the linked-in error tables, generates
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* a generic "Error 0x<errno>" message.
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*
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* The pointer returned by strerror() is valid only until the next
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* call to strerror().
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*
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*/
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const char * strerror ( int errno ) {
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static char *generic_message = "Error 0x0000";
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struct errortab *errortab;
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for ( errortab = errortab_start ; errortab < errortab_end ;
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errortab++ ) {
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if ( errortab->errno == errno )
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return errortab->text;
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}
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sprintf ( generic_message + 8, "%hx", errno );
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return generic_message;
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}
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