[freetype2] master 092f9d987 2/2: [apinames] Fix VMS handling of overly long function names.

[Werner Lemberg]

branch: master
commit 092f9d9874756380240f91716aef5e67c66f437d
Author: Werner Lemberg <wl@gnu.org>
Commit: Werner Lemberg <wl@gnu.org>

    [apinames] Fix VMS handling of overly long function names.
    
    Based on ideas from Jouk Jansen <joukj@hrem.nano.tudelft.nl>.
    
    * src/tools/vms_shorten_symbol.c: New file, taken from
    
      
https://sourceforge.net/p/vms-ports/vmsshortsym/ci/default/tree/vms_shorten_symbol.c
    
    with some minor edits to allow compilation with C++ and being included in
    another source code file.
    
    * src/tools/apinames.c: Include `vms_shorten_symbol.c`.
    (PROGRAM_VERSION): Set to '0.5'.
    (names_dump) [OUTPUT_VMS_OPT]: Call `vms_shorten_symbol` to get unique 
function
    identifiers not longer than 31 characters.
---
 src/tools/apinames.c           |  27 +++--
 src/tools/vms_shorten_symbol.c | 250 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 270 insertions(+), 7 deletions(-)

diff --git a/src/tools/apinames.c b/src/tools/apinames.c
index e1b085172..8c395aea3 100644
--- a/src/tools/apinames.c
+++ b/src/tools/apinames.c
@@ -22,8 +22,10 @@
 #include <string.h>
 #include <ctype.h>
 
+#include "vms_shorten_symbol.c"
+
 #define  PROGRAM_NAME     "apinames"
-#define  PROGRAM_VERSION  "0.4"
+#define  PROGRAM_VERSION  "0.5"
 
 #define  LINEBUFF_SIZE  1024
 
@@ -214,12 +216,23 @@ names_dump( FILE*         out,
     break;
 
   case OUTPUT_VMS_OPT:
-    fprintf( out, "GSMATCH=LEQUAL,2,0\n"
-                  "CASE_SENSITIVE=YES\n"
-                  "SYMBOL_VECTOR=(-\n" );
-    for ( nn = 0; nn < num_names - 1; nn++ )
-      fprintf( out, "    %s=PROCEDURE,-\n", the_names[nn].name );
-    fprintf( out, "    %s=PROCEDURE)\n", the_names[num_names - 1].name );
+    fprintf( out, "case_sensitive=YES\n" );
+
+    for ( nn = 0; nn < num_names; nn++ )
+    {
+      char  short_symbol[32];
+
+
+      if ( vms_shorten_symbol( the_names[nn].name, short_symbol, 1 ) == -1 )
+        panic( "could not shorten name '%s'", the_names[nn].name );
+      fprintf( out, "symbol_vector = ( %s = PROCEDURE)\n", short_symbol );
+
+      strcat( the_names[nn].name , "64__" );
+
+      if ( vms_shorten_symbol( the_names[nn].name, short_symbol, 1 ) == -1 )
+        panic( "could not shorten name '%s'", the_names[nn].name );
+      fprintf( out, "symbol_vector = ( %s = PROCEDURE)\n", short_symbol );
+    }
 
     break;
 
diff --git a/src/tools/vms_shorten_symbol.c b/src/tools/vms_shorten_symbol.c
new file mode 100644
index 000000000..81f2a7187
--- /dev/null
+++ b/src/tools/vms_shorten_symbol.c
@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2010, 2017 Craig A. Berry
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* vms_shorten_symbol
+ * 
+ * This program provides shortening of long symbols (> 31 characters) using the
+ * same mechanism as the OpenVMS C compiler.  The basic procedure is to compute
+ * an AUTODIN II checksum of the entire symbol, encode the checksum in base32,
+ * and glue together a shortened symbol from the first 23 characters of the 
+ * original symbol plus the encoded checksum appended.  The output format is
+ * the same used in the name mangler database, stored by default in 
+ * [.CXX_REPOSITORY]CXX$DEMANGLER_DB.
+ *
+ * To obtain the same result as CC/NAMES=SHORTENED, run like so:
+ * 
+ * $ mcr []vms_shorten_symbol "Please_forgive_this_absurdly_long_symbol_name"
+ * PLEASE_FORGIVE_THIS_ABS1ARO4QU$Please_forgive_this_absurdly_long_symbol_name
+ *
+ * To obtain the same result as CC/NAMES=(SHORTENED,AS_IS), pass a non-zero
+ * value as the second argument, like so:
+ *
+ * $ mcr []vms_shorten_symbol "Please_forgive_this_absurdly_long_symbol_name" 1
+ * Please_forgive_this_abs3rv8rnn$Please_forgive_this_absurdly_long_symbol_name
+ */
+ 
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef __VMS
+#define UINT32 unsigned int
+#else
+#include <inttypes.h>
+#define UINT32 uint32_t
+#endif
+
+extern UINT32 crc32(const char *input_string);
+extern int u32_to_base32(UINT32 input, char *output);
+extern int vms_shorten_symbol(const char *symbol, char *shortened, char 
as_is_flag);
+
+/*
+ * This routine implements the AUTODIN II polynomial.
+ */
+
+UINT32
+crc32(const char *input_string)
+{
+
+/*
+ * CRC code and data based partly on FreeBSD implementation, which
+ * notes:
+ *
+ * The crc32 functions and data was originally written by Spencer
+ * Garrett <srg@quick.com> and was cleaned from the PostgreSQL source
+ * tree via the files contrib/ltree/crc32.[ch].  No license was
+ * included, therefore it is assumed that this code is public
+ * domain.  Attribution still noted.
+ *
+ * (I think they mean "gleaned" not "cleaned".)
+ */
+
+    static const UINT32 autodin_ii_table[256] = {
+        0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+        0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+        0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+        0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+        0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+        0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+        0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+        0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+        0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+        0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+        0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+        0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+        0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+        0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+        0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+        0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+        0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+        0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+        0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+        0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+        0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+        0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+        0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+        0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+        0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+        0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+        0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+        0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+        0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+        0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+        0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+        0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+        0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+        0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+        0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+        0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+        0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+        0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+        0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+        0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+        0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+        0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+        0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+    };
+    
+    UINT32 crc = ~0U;
+    char *c;
+    for (c = (char *)input_string; *c; ++c)
+        crc = (crc >> 8) ^ autodin_ii_table[(crc ^ *c) & 0xff];
+    return ~crc;
+}
+
+/*
+ * This is the RFC2938 variant of base32, not RFC3548, Crockford's, or
+ * other newer variant.  It produces an 8-byte encoded character string
+ * (plus trailing null) from a 32-bit integer input.
+ */
+
+int
+u32_to_base32(UINT32 input, char *output)
+{
+    static const char base32hex_table[32] = {
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
+        'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
+        'u', 'v'
+    };
+    int i;
+
+    /* 
+     * Grab lowest 5 bits and look up conversion in table.  Lather, rinse,
+     * repeat for a total of 7, 5-bit chunks to accommodate 32 bits of input.
+     */
+    for (i = 0; i < 7; i++) {
+        output[6 - i] = base32hex_table[input & 0x1f];
+        input >>= 5;     /* position to look at next 5 */
+    }
+    output[7] = '$';     /* It's DEC, so use '$' not '=' to pad. */
+    output[8] = '\0';    
+    return 0;    
+}
+
+/*
+ * Take an input symbol name of arbitrary length and produce a symbol shortened
+ * to 31 characters.  The shortened symbol consists of the first 23 characters
+ * of the original symbol plus the 8 characters of the encoded checksum.  The
+ * third argument is a boolean indicating whether to emulate the compiler's
+ * /NAMES=AS_IS option.  When false (the compiler's default), the shortened
+ * symbol will be upper cased.  When the original symbol is 31 characters or 
+ * fewer in length, no checksum will be appended and the original symbol is
+ * returned verbatim (though upper cased if the as_is_flag is false).
+ */
+
+int
+vms_shorten_symbol(const char *input_symbol, char *shortened, char as_is_flag)
+{
+    char b32str[9];
+    UINT32 crc;
+    char *c, *symbol;
+    int symlen;
+
+    symlen = strlen(input_symbol);
+    symbol = (char *)malloc(symlen + 1);
+    if (symbol == NULL)
+        return -1;
+
+    strncpy(symbol, input_symbol, symlen);
+    symbol[symlen] = '\0';
+
+    if (!as_is_flag) {
+        for (c = symbol; *c; c++)
+            *c = toupper(*c);
+    }
+
+    if (symlen <= 31) {
+        strncpy(shortened, symbol, symlen);
+        shortened[symlen] = '\0';
+        free(symbol);
+        return 0;
+    }
+        
+    /*
+     * Compute the checksum on the whole symbol.
+     */
+
+    crc = crc32(symbol);
+
+    /* The compiler does not use the inverted checksum, so we invert it
+     * back before encoding in base32.
+     */
+
+    if (u32_to_base32(~crc, (char *)&b32str) == -1) {
+        free(symbol);
+        return -1;
+    }
+
+    if (!as_is_flag) {
+        for (c = (char *)&b32str; *c; c++)
+            *c = toupper(*c);
+    }
+
+    sprintf(shortened, "%.23s%.8s", symbol, b32str);
+    shortened[31] = '\0';
+    free(symbol);
+    return 0;
+}
+
+#ifdef TEST_MAIN
+int
+main(int argc, char **argv)
+{
+    char short_symbol[32];
+    char as_is_flag = 0;
+
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s <symbol name> [<AS_IS flag>]\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+    if (argc > 2)
+        as_is_flag = 1;
+
+    if (vms_shorten_symbol(argv[1], (char *)&short_symbol, as_is_flag) == -1) {
+        fprintf(stderr, "Symbol shortening failed\n");
+        exit(EXIT_FAILURE);
+    }
+
+    printf("%s%s\n", (char *)&short_symbol, argv[1]);
+}
+#endif