FreeCalypso > hg > freecalypso-tools
annotate rvinterf/etmsync/fsupload.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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0
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1 /* |
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2 * upload-fs implementation |
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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 <sys/param.h> |
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7 #include <sys/stat.h> |
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8 #include <dirent.h> |
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9 #include <ctype.h> |
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10 #include <stdio.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 #include <strings.h> |
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14 #include "etm.h" |
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15 #include "ffs.h" |
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16 #include "ffserr.h" |
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17 #include "tmffs2.h" |
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18 #include "limits.h" |
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19 #include "ffslimits.h" |
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20 #include "localtypes.h" |
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21 #include "localstruct.h" |
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22 #include "exitcodes.h" |
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23 |
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24 uploadfs_level(srcpath, depth, prefix) |
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25 char *srcpath, *prefix; |
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26 { |
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27 char ffs_childpath[MAX_FULL_PATHNAME+1], *ffs_childp; |
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28 DIR *rdd; |
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29 struct dirent *dirent; |
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30 char hostpath_child[MAXPATHLEN]; |
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31 struct stat hst; |
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32 int rc; |
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33 |
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34 strcpy(ffs_childpath, prefix); |
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35 ffs_childp = index(ffs_childpath, '\0'); |
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36 *ffs_childp++ = '/'; |
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37 rdd = opendir(srcpath); |
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38 if (!rdd) { |
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39 perror(srcpath); |
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40 return(ERROR_UNIX); |
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41 } |
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42 while (dirent = readdir(rdd)) { |
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43 if (dirent->d_name[0] == '.') |
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44 continue; |
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45 if (strlen(dirent->d_name) > MAX_FN_COMPONENT) { |
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46 fprintf(stderr, |
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47 "error: \"%s\" in %s exceeds the FFS component name limit\n", |
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48 dirent->d_name, srcpath); |
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49 closedir(rdd); |
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50 return(ERROR_USAGE); |
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51 } |
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52 if (strlen(srcpath) + strlen(dirent->d_name) + 2 > |
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53 sizeof hostpath_child) { |
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54 fprintf(stderr, |
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55 "error: host side pathname buffer overflow\n"); |
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56 closedir(rdd); |
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57 return(ERROR_UNIX); |
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58 } |
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59 sprintf(hostpath_child, "%s/%s", srcpath, dirent->d_name); |
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60 if (lstat(hostpath_child, &hst) < 0) { |
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61 perror(hostpath_child); |
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62 closedir(rdd); |
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63 return(ERROR_UNIX); |
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64 } |
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65 strcpy(ffs_childp, dirent->d_name); |
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66 switch (hst.st_mode & S_IFMT) { |
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67 case S_IFREG: |
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68 printf("uploading %s\n", ffs_childpath); |
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69 rc = fwrite_from_file(ffs_childpath, hostpath_child); |
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70 if (rc) { |
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71 closedir(rdd); |
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72 return(rc); |
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73 } |
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74 break; |
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75 case S_IFDIR: |
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76 if (depth >= MAX_NAME_DEPTH-1) { |
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77 fprintf(stderr, |
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78 "error: directory nesting too deep at %s\n", |
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79 hostpath_child); |
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80 closedir(rdd); |
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81 return(ERROR_USAGE); |
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82 } |
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83 printf("mkdir %s\n", ffs_childpath); |
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84 rc = do_mkdir_existok(ffs_childpath); |
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85 if (rc) { |
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86 closedir(rdd); |
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87 return(rc); |
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88 } |
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89 rc = uploadfs_level(hostpath_child, depth + 1, |
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90 ffs_childpath); |
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91 if (rc) { |
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92 closedir(rdd); |
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93 return(rc); |
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94 } |
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95 break; |
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96 default: |
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97 fprintf(stderr, |
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98 "error: %s is neither a regular file nor a directory\n", |
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99 hostpath_child); |
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100 closedir(rdd); |
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101 return(ERROR_USAGE); |
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102 } |
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103 } |
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104 closedir(rdd); |
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105 return(0); |
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106 } |
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107 |
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108 cmd_uploadfs(argc, argv) |
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109 char **argv; |
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110 { |
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111 return uploadfs_level(argv[1], 0, ""); |
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112 } |
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113 |
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114 cmd_upload_file(argc, argv) |
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115 char **argv; |
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116 { |
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117 if (strlen(argv[2]) >= TMFFS_STRING_SIZE) { |
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118 fprintf(stderr, |
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119 "error: pathname arg exceeds string length limit\n"); |
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120 return(ERROR_USAGE); |
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121 } |
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122 return fwrite_from_file(argv[2], argv[1]); |
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123 } |
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124 |
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125 cmd_upload_subtree(argc, argv) |
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126 char **argv; |
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127 { |
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128 int rc, depth; |
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129 |
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130 depth = validate_ffs_pathname(argv[2]); |
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131 if (depth < 0) |
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132 return(ERROR_USAGE); /* error msg already printed */ |
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Mychaela Falconia <falcon@freecalypso.org>
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133 if (depth == 0) { |
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Mychaela Falconia <falcon@freecalypso.org>
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134 fprintf(stderr, "please use upload-fs command instead\n"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 return(ERROR_USAGE); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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136 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 if (depth >= MAX_NAME_DEPTH) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 fprintf(stderr, "cannot upload into max-depth directory\n"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 return(ERROR_USAGE); |
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140 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 printf("mkdir %s\n", argv[2]); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 rc = do_mkdir_existok(argv[2]); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 if (rc) |
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parents:
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144 return(rc); |
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parents:
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145 return uploadfs_level(argv[1], depth, argv[2]); |
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parents:
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146 } |