FreeCalypso > hg > freecalypso-tools
annotate rvinterf/etmsync/symlink.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 | e7502631a0f9 |
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rev | line source |
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0
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1 /* |
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2 * Commands for experimenting with FFS symlinks |
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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 do_symlink(target, realobj) |
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23 char *target, *realobj; |
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24 { |
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25 u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; |
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26 int rc, targlen, reallen; |
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27 |
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28 reallen = strlen(realobj); |
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29 if (reallen >= TMFFS_STRING_SIZE) { |
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30 printf("error: pathname arg exceeds string length limit\n"); |
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31 return(ERROR_USAGE); |
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32 } |
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33 targlen = strlen(target); |
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34 if (3 + (reallen+2) + (targlen+2) + 1 > MAX_PKT_TO_TARGET) { |
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35 printf("error: symlink request fails to fit into packet\n"); |
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36 return(ERROR_USAGE); |
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37 } |
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38 dp = cmdpkt + 1; |
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39 *dp++ = ETM_FFS2; |
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40 *dp++ = TMFFS_SYMLINK; |
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41 *dp++ = reallen + 1; |
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42 strcpy(dp, realobj); |
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43 dp += reallen + 1; |
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44 *dp++ = targlen + 1; |
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45 strcpy(dp, target); |
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46 dp += targlen + 1; |
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47 rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); |
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48 if (rc) |
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49 return(rc); |
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50 if (rvi_msg_len != 5) { |
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51 printf("error: TMFFS_SYMLINK response has wrong length\n"); |
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52 return(ERROR_TARGET); |
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53 } |
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54 if (rvi_msg[3]) { |
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55 report_ffs_err("symlink", rvi_msg[3]); |
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56 return(ERROR_TARGET); |
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57 } |
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58 return(0); |
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59 } |
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60 |
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61 cmd_symlink(argc, argv) |
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62 char **argv; |
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63 { |
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64 return do_symlink(argv[1], argv[2]); |
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65 } |
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66 |
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67 do_readlink(pathname, databuf, rdret) |
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68 char *pathname; |
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69 u_char *databuf; |
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70 int *rdret; |
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71 { |
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72 u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; |
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73 int rc, slen, sz; |
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74 |
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75 slen = strlen(pathname); |
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76 if (slen >= TMFFS_STRING_SIZE) { |
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77 printf("error: pathname arg exceeds string length limit\n"); |
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78 return(ERROR_USAGE); |
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79 } |
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80 dp = cmdpkt + 1; |
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81 *dp++ = ETM_FFS2; |
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82 *dp++ = TMFFS_READLINK; |
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83 *dp++ = slen + 1; |
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84 strcpy(dp, pathname); |
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85 dp += slen + 1; |
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86 *dp++ = 0; /* dummy 2nd buffer */ |
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87 rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); |
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88 if (rc) |
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89 return(rc); |
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90 if (rvi_msg[3]) { |
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91 report_ffs_err("readlink", rvi_msg[3]); |
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92 return(ERROR_TARGET); |
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93 } |
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94 if (rvi_msg_len < 6) { |
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95 *rdret = 0; |
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96 return(0); |
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97 } |
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98 sz = rvi_msg[4]; |
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99 if (rvi_msg_len != sz + 6) { |
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100 printf("error: readlink response has wrong length\n"); |
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101 return(ERROR_TARGET); |
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102 } |
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103 bcopy(rvi_msg + 5, databuf, sz); |
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104 *rdret = sz; |
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105 return(0); |
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106 } |
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107 |
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108 cmd_readlink(argc, argv) |
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109 char **argv; |
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110 { |
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111 u_char databuf[256]; |
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112 int rc, sz, off, l; |
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113 |
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114 rc = do_readlink(argv[1], databuf, &sz); |
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115 if (rc) |
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116 return(rc); |
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117 printf("%d bytes read\n", sz); |
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118 for (off = 0; off < sz; off += 16) { |
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119 l = sz - off; |
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120 if (l > 16) |
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121 l = 16; |
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122 hexdump_line(off, databuf + off, l); |
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123 } |
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124 return(0); |
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125 } |
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126 |
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127 do_readlink_sancheck(pathname, databuf) |
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128 char *pathname; |
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129 u_char *databuf; |
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130 { |
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131 int rc, sz; |
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132 |
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133 rc = do_readlink(pathname, databuf, &sz); |
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134 if (rc) |
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135 return(rc); |
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Mychaela Falconia <falcon@freecalypso.org>
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136 if (sz < 2 || databuf[sz-1]) { |
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Mychaela Falconia <falcon@freecalypso.org>
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137 printf("error: readlink on %s returned garbage\n", pathname); |
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Mychaela Falconia <falcon@freecalypso.org>
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138 return(ERROR_TARGET); |
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parents:
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139 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 return(0); |
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parents:
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141 } |