FreeCalypso > hg > freecalypso-tools
annotate rvinterf/etmsync/fsbasics.c @ 465:003e48f8ebe1
rvinterf/etmsync/fsnew.c: cast 0 to (char *) for execl sentinel
I generally don't use NULL and use plain 0 instead, based on a "NULL
considered harmful" discussion on the classiccmp mailing list many aeons
ago (I couldn't find it, and I reason that it must have been 2005 or
earlier), but a recent complaint by a packager sent me searching, and I
found this:
https://ewontfix.com/11/
While I don't give a @#$% about "modern" systems and code-nazi tools,
I realized that passing a plain 0 as a pointer sentinel in execl is wrong
because it will break on systems where pointers are longer than the plain
int type. Again, I don't give a @#$% about the abomination of x86_64 and
the like, but if anyone ever manages to port my code to something like a
PDP-11 (16-bit int, 32-bit long and pointers), then passing a plain 0
as a function argument where a pointer is expected most definitely won't
work: if the most natural stack slot and SP alignment unit is 16 bits,
fitting an int, with longs and pointers taking up two such slots, then
the call stack will be totally wrong with a plain 0 passed for a pointer.
Casting the 0 to (char *) ought to be the most kosher solution for the
most retro systems possible.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 11 Feb 2019 00:00:19 +0000 |
parents | 46ad66a231af |
children | 74d284add54d |
rev | line source |
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0
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1 /* |
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2 * Basic FFS2 operations |
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3 */ |
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4 |
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5 #include <sys/types.h> |
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6 #include <stdio.h> |
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7 #include <stdlib.h> |
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8 #include <string.h> |
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9 #include <strings.h> |
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10 #include "etm.h" |
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11 #include "ffs.h" |
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12 #include "tmffs2.h" |
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13 #include "limits.h" |
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14 #include "ffslimits.h" |
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15 #include "localtypes.h" |
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16 #include "localstruct.h" |
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17 #include "exitcodes.h" |
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18 |
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19 extern u_char rvi_msg[]; |
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20 extern int rvi_msg_len; |
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21 |
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22 cmd_ffs2ver() |
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23 { |
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24 u_char cmdpkt[4]; |
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25 int rc; |
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26 |
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27 cmdpkt[1] = ETM_FFS2; |
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28 cmdpkt[2] = TMFFS_VERSION; |
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29 rc = etm_pkt_exch(cmdpkt, 2); |
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30 if (rc) |
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31 return(rc); |
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32 if (rvi_msg[3]) { |
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33 printf("FFS2 error %d\n", rvi_msg[3]); |
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34 return(ERROR_TARGET); |
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35 } |
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36 if (rvi_msg_len != 7) { |
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37 printf("error: FFS2 version response has wrong length\n"); |
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38 return(ERROR_TARGET); |
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39 } |
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40 printf("FFS2 version: %02X.%02X\n", rvi_msg[5], rvi_msg[4]); |
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41 return(0); |
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42 } |
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43 |
13
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44 do_ls_short(lsarg) |
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45 char *lsarg; |
0
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46 { |
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47 u_char state[4]; |
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48 char namebuf[256]; |
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49 int nument, i, rc; |
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50 |
13
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51 rc = do_opendir(lsarg, state, &nument); |
0
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52 if (rc) |
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53 return(rc); |
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54 if (!nument) { |
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55 printf("<empty dir>\n"); |
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56 return(0); |
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57 } |
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58 for (i = 0; i < nument; i++) { |
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59 rc = do_readdir(state, namebuf, sizeof namebuf); |
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60 if (rc) |
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61 return(rc); |
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62 printf("%s\n", namebuf); |
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63 } |
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64 return(0); |
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65 } |
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66 |
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67 cmd_ls(argc, argv) |
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68 char **argv; |
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69 { |
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70 if (argc == 2) |
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71 return do_ls_short(argv[1]); |
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72 if (strcmp(argv[1], "-l")) { |
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73 fprintf(stderr, "usage: ls [-l] ffs_pathname\n"); |
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74 return(ERROR_USAGE); |
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75 } |
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76 return do_ls_long(argv[2]); |
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77 } |
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78 |
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79 cmd_stat(argc, argv) |
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80 char **argv; |
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81 { |
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82 struct stat_info stat; |
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83 int rc; |
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84 char *type; |
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85 |
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86 rc = do_xlstat(argv[1], &stat); |
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87 if (rc) |
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88 return(rc); |
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89 switch (stat.type) { |
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90 case OT_FILE: |
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91 type = "file"; |
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92 break; |
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93 case OT_DIR: |
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94 type = "directory"; |
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95 break; |
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96 case OT_LINK: |
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97 type = "symlink"; |
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98 break; |
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99 default: |
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100 type = "???"; |
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101 } |
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102 printf("Type: %s%s\n", type, |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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103 stat.flags & OF_READONLY ? ", read-only" : ""); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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104 printf("inode %x\n", stat.inode); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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105 printf("size %u, space %u\n", stat.size, stat.space); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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106 printf("location=%x, block %d\n", stat.location, stat.block); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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107 return(0); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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108 } |