diff options
Diffstat (limited to 'source/components/utilities/utstring.c')
-rw-r--r-- | source/components/utilities/utstring.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/source/components/utilities/utstring.c b/source/components/utilities/utstring.c index 9798700..282869c 100644 --- a/source/components/utilities/utstring.c +++ b/source/components/utilities/utstring.c @@ -685,3 +685,78 @@ UtConvertBackslashes ( } } #endif + +#if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION) +/******************************************************************************* + * + * FUNCTION: AcpiUtSafeStrcpy, AcpiUtSafeStrcat, AcpiUtSafeStrncat + * + * PARAMETERS: Adds a "DestSize" parameter to each of the standard string + * functions. This is the size of the Destination buffer. + * + * RETURN: TRUE if the operation would overflow the destination buffer. + * + * DESCRIPTION: Safe versions of standard Clib string functions. Ensure that + * the result of the operation will not overflow the output string + * buffer. + * + * NOTE: These functions are typically only helpful for processing + * user input and command lines. For most ACPICA code, the + * required buffer length is precisely calculated before buffer + * allocation, so the use of these functions is unnecessary. + * + ******************************************************************************/ + +BOOLEAN +AcpiUtSafeStrcpy ( + char *Dest, + ACPI_SIZE DestSize, + char *Source) +{ + + if (ACPI_STRLEN (Source) >= DestSize) + { + return (TRUE); + } + + ACPI_STRCPY (Dest, Source); + return (FALSE); +} + +BOOLEAN +AcpiUtSafeStrcat ( + char *Dest, + ACPI_SIZE DestSize, + char *Source) +{ + + if ((ACPI_STRLEN (Dest) + ACPI_STRLEN (Source)) >= DestSize) + { + return (TRUE); + } + + ACPI_STRCAT (Dest, Source); + return (FALSE); +} + +BOOLEAN +AcpiUtSafeStrncat ( + char *Dest, + ACPI_SIZE DestSize, + char *Source, + ACPI_SIZE MaxTransferLength) +{ + ACPI_SIZE ActualTransferLength; + + + ActualTransferLength = ACPI_MIN (MaxTransferLength, ACPI_STRLEN (Source)); + + if ((ACPI_STRLEN (Dest) + ActualTransferLength) >= DestSize) + { + return (TRUE); + } + + ACPI_STRNCAT (Dest, Source, MaxTransferLength); + return (FALSE); +} +#endif |