annotate rvinterf/etmsync/dispatch.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>
date Mon, 11 Feb 2019 00:00:19 +0000
parents e7502631a0f9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 * This module implements the command dispatch for fc-fsio
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3 * and possibly other similar utilities in the future.
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4 */
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5
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11 #include "cmdtab.h"
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12 #include "exitcodes.h"
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13
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14 extern struct cmdtab cmdtab[];
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15
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16 parse_and_dispatch_cmd(cmd, is_script)
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Mychaela Falconia <falcon@freecalypso.org>
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17 char *cmd;
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18 {
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19 char *argv[MAX_CMD_ARGS+2];
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20 char *cp, **ap;
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21 struct cmdtab *tp;
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22
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23 for (cp = cmd; isspace(*cp); cp++)
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24 ;
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25 if (!*cp || *cp == '#')
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26 return(0);
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27 if (is_script)
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28 printf("Script command: %s\n", cp);
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29 argv[0] = cp;
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30 while (*cp && !isspace(*cp))
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31 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
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32 if (*cp)
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33 *cp++ = '\0';
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34 for (tp = cmdtab; tp->cmd; tp++)
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35 if (!strcmp(tp->cmd, argv[0]))
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36 break;
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37 if (!tp->func) {
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Mychaela Falconia <falcon@freecalypso.org>
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38 fprintf(stderr, "error: no such command\n");
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39 return(ERROR_USAGE);
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Mychaela Falconia <falcon@freecalypso.org>
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40 }
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41 for (ap = argv + 1; ; ) {
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42 while (isspace(*cp))
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43 cp++;
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44 if (!*cp || *cp == '#')
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Mychaela Falconia <falcon@freecalypso.org>
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45 break;
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46 if (ap - argv - 1 >= tp->maxargs) {
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Mychaela Falconia <falcon@freecalypso.org>
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47 fprintf(stderr, "error: too many arguments\n");
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48 return(ERROR_USAGE);
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49 }
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50 if (*cp == '"') {
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51 *ap++ = ++cp;
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52 while (*cp && *cp != '"')
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53 cp++;
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54 if (*cp != '"') {
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55 fprintf(stderr,
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56 "error: unterminated quoted string\n");
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57 return(ERROR_USAGE);
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58 }
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59 *cp++ = '\0';
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60 } else {
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61 *ap++ = cp;
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62 while (*cp && !isspace(*cp))
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63 cp++;
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64 if (*cp)
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65 *cp++ = '\0';
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66 }
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67 }
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68 if (ap - argv - 1 < tp->minargs) {
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69 fprintf(stderr, "error: too few arguments\n");
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70 return(ERROR_USAGE);
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71 }
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72 *ap = 0;
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73 return tp->func(ap - argv, argv);
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74 }
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75
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76 dispatch_ready_argv(argc, argv)
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77 char **argv;
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78 {
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79 struct cmdtab *tp;
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80
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81 for (tp = cmdtab; tp->cmd; tp++)
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82 if (!strcmp(tp->cmd, argv[0]))
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83 break;
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84 if (!tp->func) {
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85 fprintf(stderr, "error: no such command\n");
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86 return(ERROR_USAGE);
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87 }
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88 if (argc - 1 > tp->maxargs) {
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89 fprintf(stderr, "error: too many arguments\n");
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90 return(ERROR_USAGE);
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91 }
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92 if (argc - 1 < tp->minargs) {
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93 fprintf(stderr, "error: too few arguments\n");
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94 return(ERROR_USAGE);
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95 }
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96 return tp->func(argc, argv);
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97 }
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Mychaela Falconia <falcon@freecalypso.org>
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98
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Mychaela Falconia <falcon@freecalypso.org>
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99 cmd_exec(argc, argv)
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100 char **argv;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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101 {
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Mychaela Falconia <falcon@freecalypso.org>
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102 FILE *f;
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Mychaela Falconia <falcon@freecalypso.org>
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103 char linebuf[512], *cp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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104 int lineno, retval = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 f = fopen(argv[1], "r");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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107 if (!f) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 perror(argv[1]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 return(ERROR_USAGE);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 for (lineno = 1; fgets(linebuf, sizeof linebuf, f); lineno++) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 cp = index(linebuf, '\n');
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 if (!cp) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 fprintf(stderr, "%s line %d: missing newline\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 argv[1], lineno);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 fclose(f);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 return(ERROR_USAGE);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 *cp = '\0';
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 retval = parse_and_dispatch_cmd(linebuf, 1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 if (retval)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 break;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 fclose(f);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 return(retval);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 cmd_exit()
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 exit(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 }