Compile time and runtime checks for library compatibility
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@ -49,7 +49,89 @@ extern struct isoburn *isoburn_list_start; /* in isoburn.c */
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int isoburn_initialize(char msg[1024], int flag)
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{
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int major, minor, micro;
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int major, minor, micro, bad_match= 0;
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/* First two ugly compile time checks for header version compatibility.
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If everthing matches, then they produce no C code. In case of mismatch,
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intentionally faulty C code will be inserted.
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*/
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#ifdef iso_lib_header_version_major
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/* The minimum requirement of libisoburn towards the libisofs header
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at compile time is defined in libisoburn/libisoburn.h :
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isoburn_libisofs_req_major
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isoburn_libisofs_req_minor
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isoburn_libisofs_req_micro
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It gets compared against the version macros in libisofs/libisofs.h :
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iso_lib_header_version_major
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iso_lib_header_version_minor
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iso_lib_header_version_micro
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If the header is too old then the following code shall cause failure of
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cdrskin compilation rather than to allow production of a program with
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unpredictable bugs or memory corruption.
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The compiler messages supposed to appear in this case are:
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error: 'LIBISOFS_MISCONFIGURATION' undeclared (first use in this function)
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error: 'INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libisofs_dot_h_TOO_OLD__SEE_libisoburn_dot_h_and_burn_wrap_dot_h' undeclared (first use in this function)
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error: 'LIBISOFS_MISCONFIGURATION_' undeclared (first use in this function)
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*/
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/* The indendation is an advise of man gcc to help old compilers ignoring */
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#if isoburn_libisofs_req_major > iso_lib_header_version_major
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#define Isoburn_libisofs_dot_h_too_olD 1
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#endif
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#if isoburn_libisofs_req_major == iso_lib_header_version_major && isoburn_libisofs_req_minor > iso_lib_header_version_minor
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#define Isoburn_libisofs_dot_h_too_olD 1
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#endif
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#if isoburn_libisofs_req_minor == iso_lib_header_version_minor && isoburn_libisofs_req_micro > iso_lib_header_version_micro
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#define Isoburn_libisofs_dot_h_too_olD 1
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#endif
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#ifdef Isoburn_libisofs_dot_h_too_olD
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LIBISOFS_MISCONFIGURATION = 0;
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INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libisofs_dot_h_TOO_OLD__SEE_libisoburn_dot_h_and_burn_wrap_dot_h = 0;
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LIBISOFS_MISCONFIGURATION_ = 0;
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#endif
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#endif /* iso_lib_header_version_major */
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/* The minimum requirement of libisoburn towards the libburn header
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at compile time is defined in libisoburn/libisoburn.h :
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isoburn_libburn_req_major
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isoburn_libburn_req_minor
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isoburn_libburn_req_micro
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It gets compared against the version macros in libburn/libburn.h :
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burn_header_version_major
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burn_header_version_minor
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burn_header_version_micro
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If the header is too old then the following code shall cause failure of
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cdrskin compilation rather than to allow production of a program with
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unpredictable bugs or memory corruption.
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The compiler messages supposed to appear in this case are:
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error: 'LIBBURN_MISCONFIGURATION' undeclared (first use in this function)
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error: 'INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libburn_dot_h_TOO_OLD__SEE_libisoburn_dot_h_and_burn_wrap_dot_h' undeclared (first use in this function)
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error: 'LIBBURN_MISCONFIGURATION_' undeclared (first use in this function)
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*/
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/* The indendation is an advise of man gcc to help old compilers ignoring */
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#if isoburn_libburn_req_major > burn_header_version_major
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#define Isoburn_libburn_dot_h_too_olD 1
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#endif
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#if isoburn_libburn_req_major == burn_header_version_major && isoburn_libburn_req_minor > burn_header_version_minor
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#define Isoburn_libburn_dot_h_too_olD 1
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#endif
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#if isoburn_libburn_req_minor == burn_header_version_minor && isoburn_libburn_req_micro > burn_header_version_micro
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#define Isoburn_libburn_dot_h_too_olD 1
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#endif
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#ifdef Isoburn_libburn_dot_h_too_olD
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LIBBURN_MISCONFIGURATION = 0;
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INTENTIONAL_ABORT_OF_COMPILATION__HEADERFILE_libburn_dot_h_TOO_OLD__SEE_libisoburn_dot_h_and_burn_wrap_dot_h = 0;
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LIBBURN_MISCONFIGURATION_ = 0;
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#endif
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/* End of ugly compile time tests (scroll up for explanation) */
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msg[0]= 0;
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if(iso_init()<0) {
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@ -57,33 +139,56 @@ int isoburn_initialize(char msg[1024], int flag)
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return(0);
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}
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iso_lib_version(&major, &minor, µ);
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sprintf(msg+strlen(msg), "libisofs-%d.%d.%d , ", major, minor, micro);
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/* >>> check for suitability of library */
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sprintf(msg+strlen(msg), "libisofs-%d.%d.%d ", major, minor, micro);
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#ifdef iso_lib_header_version_major
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if(iso_lib_is_compatible(iso_lib_header_version_major,
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iso_lib_header_version_minor,
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iso_lib_header_version_micro)) {
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sprintf(msg+strlen(msg), "ok, ");
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} else {
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sprintf(msg+strlen(msg),"- TOO OLD -, need at least libisofs-%d.%d.%d ,\n",
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iso_lib_header_version_major, iso_lib_header_version_minor,
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iso_lib_header_version_micro);
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bad_match= 1;
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}
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#else
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if(iso_lib_is_compatible(isoburn_libisofs_req_major,
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isoburn_libisofs_req_minor,
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isoburn_libisofs_req_micro)) {
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sprintf(msg+strlen(msg), "suspicious, ");
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} else {
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sprintf(msg+strlen(msg),"- TOO OLD -, need at least libisofs-%d.%d.%d ,\n",
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isoburn_libisofs_req_major, isoburn_libisofs_req_minor,
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isoburn_libisofs_req_micro);
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bad_match= 1;
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}
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#endif /* ! iso_lib_header_version_major */
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if(!burn_initialize()) {
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sprintf(msg+strlen(msg), "Cannot initialize libburn\n");
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return(0);
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}
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burn_version(&major, &minor, µ);
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sprintf(msg+strlen(msg), "libburn-%d.%d.%d , ", major, minor, micro);
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sprintf(msg+strlen(msg), "libburn-%d.%d.%d ", major, minor, micro);
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if(major > burn_header_version_major
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|| (major == burn_header_version_major
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&& (minor > burn_header_version_minor
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|| (minor == burn_header_version_minor
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&& micro >= burn_header_version_micro)))) {
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; /* ok */
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sprintf(msg+strlen(msg), "ok, ");
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} else {
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sprintf(msg+strlen(msg), "- TOO OLD -, need at least libburn-%d.%d.%d ,\n",
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burn_header_version_major, burn_header_version_minor,
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burn_header_version_micro);
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return(0);
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bad_match= 1;
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}
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isoburn_destroy_all(&isoburn_list_start, 0); /* isoburn_list_start= NULL */
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isoburn_version(&major, &minor, µ);
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sprintf(msg+strlen(msg), "libisoburn-%d.%d.%d", major, minor, micro);
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sprintf(msg+strlen(msg), "for libisoburn-%d.%d.%d", major, minor, micro);
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if(bad_match)
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return(0);
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isoburn_destroy_all(&isoburn_list_start, 0); /* isoburn_list_start= NULL */
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return(1);
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}
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@ -138,21 +138,6 @@ int isoburn_initialize(char msg[1024], int flag);
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int isoburn_is_compatible(int major, int minor, int micro, int flag);
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/** These three release version numbers tell the revision of this header file
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and of the API it describes. They are memorized by applications at build
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time.
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*/
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#define isoburn_header_version_major 0
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#define isoburn_header_version_minor 0
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#define isoburn_header_version_micro 1
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/** Note:
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Above version numbers are also recorded in configure.ac because libtool
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wants them as parameters at build time.
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For the library compatibility check ISOBURN_*_VERSION in configure.ac
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are not decisive. Only the three numbers above do matter.
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*/
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/** Obtain the three release version numbers of the library. These are the
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numbers encountered by the application when linking with libisoburn,
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i.e. possibly not before run time.
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@ -174,6 +159,77 @@ int isoburn_is_compatible(int major, int minor, int micro, int flag);
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*/
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void isoburn_version(int *major, int *minor, int *micro);
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/** The minimum version of libisofs to be used with this version of libisoburn
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*/
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#define isoburn_libisofs_req_major 0
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#define isoburn_libisofs_req_minor 6
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#define isoburn_libisofs_req_micro 1
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/** The minimum version of libburn to be used with this version of libisoburn
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*/
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#define isoburn_libburn_req_major 0
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#define isoburn_libburn_req_minor 4
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#define isoburn_libburn_req_micro 2
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/** These three release version numbers tell the revision of this header file
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and of the API it describes. They are memorized by applications at build
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time.
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*/
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#define isoburn_header_version_major 0
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#define isoburn_header_version_minor 0
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#define isoburn_header_version_micro 1
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/** Note:
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Above version numbers are also recorded in configure.ac because libtool
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wants them as parameters at build time.
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For the library compatibility check ISOBURN_*_VERSION in configure.ac
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are not decisive. Only the three numbers above do matter.
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*/
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/** Usage discussion:
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Some developers of the libburnia project have differing
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opinions how to ensure the compatibility of libaries
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and applications.
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It is about whether to use at compile time and at runtime
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the version numbers isoburn_header_version_* provided here.
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Thomas Schmitt advises to use them.
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Vreixo Formoso advises to use other means.
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At compile time:
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Vreixo Formoso advises to leave proper version matching
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to properly programmed checks in the the application's
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build system, which will eventually refuse compilation.
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Thomas Schmitt advises to use the macros defined here
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for comparison with the application's requirements of
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library revisions and to eventually break compilation.
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Both advises are combinable. I.e. be master of your
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build system and have #if checks in the source code
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of your application, nevertheless.
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At runtime (via *_is_compatible()):
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Vreixo Formoso advises to compare the application's
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requirements of library revisions with the runtime
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library. This is to allow runtime libraries which are
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young enough for the application but too old for
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the lib*.h files seen at compile time.
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Thomas Schmitt advises to compare the header
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revisions defined here with the runtime library.
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This is to enforce a strictly monotonous chain
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of revisions from app to header to library,
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at the cost of excluding some older libraries.
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These two advises are mutually exclusive.
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For an implementation of the Thomas Schmitt approach,
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see libisoburn/burn_wrap.c : isoburn_initialize()
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*/
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/** Aquire a target drive by its filesystem path resp. libburn persistent
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address.
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@ -134,14 +134,16 @@ copy_files libisofs/*.[ch] "$lone_dir"/libisofs
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# To get a common version.h
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cat version.h.in >> "$lone_dir"/version.h.in
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sed -e 's/FNM_FILE_NAME/FNM_PATHNAME/g' \
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<libisofs/tree.c >"$lone_dir"/libisofs/tree.c
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# <<< obsoleted patchings
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# <<< obsoleted
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if test 1 = 0
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then
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# Change GNU macro name to POSIX name
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sed -e 's/FNM_FILE_NAME/FNM_PATHNAME/g' \
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<libisofs/tree.c >"$lone_dir"/libisofs/tree.c
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# Filter out the semi-illegal TODO comments
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( cd "$lone_dir"/libisofs && grep '^[[:space:]]*//' *.[ch] | less )
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echo "Is it ok delete all shown //-lines ?"
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@ -1 +1 @@
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#define Xorriso_timestamP "2008.01.31.152131"
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#define Xorriso_timestamP "2008.01.31.214647"
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@ -17,6 +17,12 @@
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struct XorrisO;
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struct FindjoB;
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/* The minimum version of libisoburn to be used with this version of xorriso
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*/
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#define xorriso_libisoburn_req_major 0
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#define xorriso_libisoburn_req_minor 0
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#define xorriso_libisoburn_req_micro 1
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int Xorriso_startup_libraries(struct XorrisO *xorriso, int flag);
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/* @param flag bit0= global shutdown of libraries */
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