Return to ethernet.c CVS log

Up to [The Machine Emulator] / tme / generic

Annotation of tme/generic/ethernet.c, revision 1.1.1.2

1.1.1.2 ! root        1: /* $Id: ethernet.c,v 1.2 2005/05/09 01:53:43 fredette Exp $ */
1.1       root        2: 
                      3: /* generic/ethernet.c - generic ethernet implementation support: */
                      4: 
                      5: /*
                      6:  * Copyright (c) 2003 Matt Fredette
                      7:  * All rights reserved.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *      This product includes software developed by Matt Fredette.
                     20:  * 4. The name of the author may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     25:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
                     26:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
                     27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
                     31:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
                     32:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     33:  * POSSIBILITY OF SUCH DAMAGE.
                     34:  */
                     35: 
                     36: #include <tme/common.h>
1.1.1.2 ! root       37: _TME_RCSID("$Id: ethernet.c,v 1.2 2005/05/09 01:53:43 fredette Exp $");
1.1       root       38: 
                     39: /* includes: */
                     40: #include <tme/generic/ethernet.h>
                     41: #include <stdlib.h>
                     42: 
                     43: /* the Ethernet broadcast address: */
                     44: const tme_uint8_t tme_ethernet_addr_broadcast[TME_ETHERNET_ADDR_SIZE] = {
                     45:   0xff, 0xff, 0xff, 0xff, 0xff, 0xff
                     46: };
                     47: 
                     48: /* this scores an Ethernet connection: */
                     49: int
                     50: tme_ethernet_connection_score(struct tme_connection *conn, unsigned int *_score)
                     51: {
                     52:   /* both sides must be Ethernet connections: */
                     53:   assert(conn->tme_connection_type == TME_CONNECTION_ETHERNET);
                     54:   assert(conn->tme_connection_other->tme_connection_type == TME_CONNECTION_ETHERNET);
                     55: 
                     56:   /* XXX we don't do any real checking: */
                     57:   *_score = 1;
                     58:   return (TME_OK);
                     59: }
                     60: 
                     61: /* this parses an ethernet address: */
                     62: int
                     63: tme_ethernet_addr_parse(const char *addr_string, tme_uint8_t *addr_bytes)
                     64: {
                     65:   const char *p1;
                     66:   char *p2;
                     67:   unsigned long byte;
                     68:   int byte_i;
                     69: 
                     70:   /* if we were given a NULL string, the parse fails: */
                     71:   if (addr_string == NULL) {
                     72:     return (EINVAL);
                     73:   }
                     74: 
                     75:   /* loop converting bytes: */
                     76:   p1 = addr_string;
                     77:   byte_i = 0;
                     78:   for(;;) {
                     79:     
                     80:     /* convert the next byte: */
                     81:     byte = strtoul(p1, &p2, 16);
                     82: 
                     83:     /* if some characters were converted: */
                     84:     if (p2 != p1) {
                     85:       
                     86:       /* if this byte is out of range, the parse fails: */
                     87:       if (byte > 0xff) {
                     88:        return (EINVAL);
                     89:       }
                     90: 
                     91:       /* if this is one too many bytes for an Ethernet address, the parse fails: */
                     92:       else if (byte_i == TME_ETHERNET_ADDR_SIZE) {
                     93:        return (EINVAL);
                     94:       }
                     95: 
                     96:       /* store this byte: */
                     97:       addr_bytes[byte_i++] = byte;
                     98:     }
                     99: 
                    100:     /* if the conversion stopped on a NUL: */
                    101:     if (*p2 == '\0') {
                    102:       
                    103:       /* if we haven't converted enough bytes, the parse fails,
                    104:         otherwise the parse succeeds: */
                    105:       return ((byte_i == TME_ETHERNET_ADDR_SIZE)
                    106:              ? TME_OK
                    107:              : EINVAL);
                    108:     }
                    109: 
                    110:     /* if the conversion stopped on a colon, skip the colon and continue: */
                    111:     else if (*p2 == ':') {
                    112:       p1 = p2 + 1;
                    113:     }
                    114: 
                    115:     /* otherwise, the parse fails: */
                    116:     else {
                    117:       return (EINVAL);
                    118:     }
                    119:   }
                    120:   /* NOTREACHED */
                    121: }
                    122: 
                    123: /* this copies frame chunks: */
                    124: unsigned int
                    125: tme_ethernet_chunks_copy(struct tme_ethernet_frame_chunk *chunks_dst,
                    126:                         const struct tme_ethernet_frame_chunk *chunks_src)
                    127: {
                    128:   struct tme_ethernet_frame_chunk *chunk_dst;
                    129:   const struct tme_ethernet_frame_chunk *chunk_src;
                    130:   tme_uint8_t *chunk_bytes_dst;
                    131:   const tme_uint8_t *chunk_bytes_src;
                    132:   unsigned int chunk_size_dst;
                    133:   unsigned int chunk_size_src;
                    134:   unsigned int chunk_size;
                    135:   unsigned int frame_size_total;
                    136: 
                    137:   chunk_src = chunks_src;
                    138:   chunk_bytes_src = chunk_src->tme_ethernet_frame_chunk_bytes;
                    139:   chunk_size_src = chunk_src->tme_ethernet_frame_chunk_bytes_count;
                    140:   
                    141:   frame_size_total = 0;
                    142: 
                    143:   /* if we have been given a destination: */
                    144:   if (chunks_dst != NULL) {
                    145: 
                    146:     chunk_dst = chunks_dst;
                    147:     chunk_bytes_dst = chunk_dst->tme_ethernet_frame_chunk_bytes;
                    148:     chunk_size_dst = chunk_dst->tme_ethernet_frame_chunk_bytes_count;
                    149: 
                    150:     /* copy until we run out of source or destination chunks: */
                    151:     for (; (chunk_dst != NULL
                    152:            && chunk_src != NULL); ) {
                    153:       
                    154:       /* get the amount we can copy now: */
                    155:       chunk_size = TME_MIN(chunk_size_dst, chunk_size_src);
                    156:       assert(chunk_size > 0);
                    157:       
                    158:       /* copy: */
                    159:       memcpy(chunk_bytes_dst, chunk_bytes_src, chunk_size);
                    160:       
                    161:       /* update: */
                    162:       frame_size_total += chunk_size;
                    163:       chunk_bytes_src += chunk_size;
                    164:       chunk_size_src -= chunk_size;
                    165:       if (chunk_size_src == 0
                    166:          && (chunk_src = chunk_src->tme_ethernet_frame_chunk_next) != NULL) {
                    167:        chunk_bytes_src = chunk_src->tme_ethernet_frame_chunk_bytes;
                    168:        chunk_size_src = chunk_src->tme_ethernet_frame_chunk_bytes_count;
                    169:       }
                    170:       chunk_bytes_dst += chunk_size;
                    171:       chunk_size_dst -= chunk_size;
                    172:       if (chunk_size_dst == 0
                    173:          && (chunk_dst = chunk_dst->tme_ethernet_frame_chunk_next) != NULL) {
                    174:        chunk_bytes_dst = chunk_dst->tme_ethernet_frame_chunk_bytes;
1.1.1.2 ! root      175:        chunk_size_dst = chunk_dst->tme_ethernet_frame_chunk_bytes_count;
1.1       root      176:       }
                    177:     }
                    178:   }
                    179: 
                    180:   /* count up the uncopied bytes: */
                    181:   for (; chunk_src != NULL; ) {
                    182:     frame_size_total += chunk_size_src;
                    183:     if ((chunk_src = chunk_src->tme_ethernet_frame_chunk_next) != NULL) {
                    184:       chunk_size_src = chunk_src->tme_ethernet_frame_chunk_bytes_count;
                    185:     }
                    186:   }
                    187: 
                    188:   /* done: */
                    189:   return (frame_size_total);
                    190: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.