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annotate toys/pending/test.c @ 1005:03f72b57a092

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author Rob Landley <rob@landley.net>
date Wed, 14 Aug 2013 19:09:33 -0500
parents 9927d1d1e7e2
children
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1 /* test.c - evaluate expression
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2 *
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3 * Copyright 2013 Rob Landley <rob@landley.net>
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4 *
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
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6
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7 USE_TEST(NEWTOY(test, NULL, TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config TEST
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10 bool "test"
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11 default n
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12 help
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13 usage: test [-bcdefghLPrSsuwx PATH] [-nz STRING] [-t FD] [X ?? Y]
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14
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15 Return true or false by performing tests. (With no arguments return false.)
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16
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17 --- Tests with a single argument (after the option):
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18 PATH is/has:
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19 -b block device -f regular file -p fifo -u setuid bit
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20 -c char device -g setgid -r read bit -w write bit
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21 -d directory -h symlink -S socket -x execute bit
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22 -e exists -L symlink -s nonzero size
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23 STRING is:
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24 -n nonzero size -z zero size (STRING by itself implies -n)
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25 FD (integer file descriptor) is:
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26 -t a TTY
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27
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28 --- Tests with one argument on each side of an operator:
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29 Two strings:
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30 = are identical != differ
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31 Two integers:
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32 -eq equal -gt first > second -lt first < second
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33 -ne not equal -ge first >= second -le first <= second
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34
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35 --- Modify or combine tests:
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36 ! EXPR not (swap true/false) EXPR -a EXPR and (are both true)
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37 ( EXPR ) evaluate this first EXPR -o EXPR or (is either true)
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38 */
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39
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40 #include "toys.h"
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41
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42 void test_main(void)
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43 {
964
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44 int id, not;
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45 char *s, *err_fmt = "Bad flag '%s'";
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46
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47 toys.exitval = 2;
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48 if (!strcmp("[", toys.which->name))
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49 if (!strcmp("]", toys.optargs[--toys.optc])) error_exit("Missing ']'");
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50 if (!strcmp("!", toys.optargs[0])) {
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51 not = 1;
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52 toys.optargs++;
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53 toys.optc--;
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54 }
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55 if (!toys.optc) toys.exitval = 0;
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56 else if (toys.optargs[0][0] == '-') {
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57 id = stridx("bcdefghLpSsurwxznt", toys.optargs[0][1]);
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58 if (id == -1 || toys.optargs[0][2]) error_exit(err_fmt, toys.optargs[0]);
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59 if (id < 12) {
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60 struct stat st;
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61 int nolink;
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62
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63 toys.exitval = 1;
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64 if (lstat(toys.optargs[1], &st) == -1) return;
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65 nolink = !S_ISLNK(st.st_mode);
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66 if (!nolink && (stat(toys.optargs[1], &st) == -1)) return;
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67
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68 if (id == 0) toys.exitval = !S_ISBLK(st.st_mode); // b
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69 else if (id == 1) toys.exitval = !S_ISCHR(st.st_mode); // c
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70 else if (id == 2) toys.exitval = !S_ISDIR(st.st_mode); // d
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71 else if (id == 3) toys.exitval = 0; // e
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72 else if (id == 4) toys.exitval = !S_ISREG(st.st_mode); // f
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73 else if (id == 5) toys.exitval = !(st.st_mode & S_ISGID); // g
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74 else if ((id == 6) || (id == 7)) toys.exitval = nolink; // hL
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75 else if (id == 8) toys.exitval = !S_ISFIFO(st.st_mode); // p
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76 else if (id == 9) toys.exitval = !S_ISSOCK(st.st_mode); // S
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77 else if (id == 10) toys.exitval = st.st_size == 0; // s
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78 else toys.exitval = !(st.st_mode & S_ISUID); // u
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79 }
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80 else if (id < 15) // rwx
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81 toys.exitval = access(toys.optargs[1], 1 << (id - 12)) == -1;
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82 else if (id < 17) // zn
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83 toys.exitval = toys.optargs[1] && !*toys.optargs[1] ^ (id - 15);
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84 else { // t
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85 struct termios termios;
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86 toys.exitval = tcgetattr(atoi(toys.optargs[1]), &termios) == -1;
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87 }
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88 }
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89 else if (toys.optc == 1) toys.exitval = *toys.optargs[0] == 0;
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90 else if (toys.optc == 3) {
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91 if (*toys.optargs[1] == '-') {
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92 long a = atol(toys.optargs[0]), b = atol(toys.optargs[2]);
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93
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94 s = toys.optargs[1] + 1;
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95 if (!strcmp("eq", s)) toys.exitval = a != b;
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96 else if (!strcmp("ne", s)) toys.exitval = a == b;
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97 else if (!strcmp("gt", s)) toys.exitval = a < b;
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98 else if (!strcmp("ge", s)) toys.exitval = a <= b;
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99 else if (!strcmp("lt", s)) toys.exitval = a > b;
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100 else if (!strcmp("le", s)) toys.exitval = a >= b;
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101 else error_exit(err_fmt, toys.optargs[1]);
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102 }
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103 else {
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104 int result = strcmp(toys.optargs[0], toys.optargs[2]);
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105
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106 s = toys.optargs[1];
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107 if (!strcmp("=", s)) toys.exitval = !!result;
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108 else if (!strcmp("!=", s)) toys.exitval = !result;
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109 else error_exit(err_fmt, toys.optargs[1]);
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110 }
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111 }
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112 toys.exitval ^= not;
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113 return;
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114 }