calc.c

   1 /* depend: */
   2 /* cflags: */
   3 /* linker: atoi.o debug.o fdprintf.o parser.o -lm */
   4
   5 //#include <malloc.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <unistd.h>
   9
  10 #include "atoi.h"
  11 #include "debug.h"
  12 #include "fdprintf.h"
  13 #include "parser.h"
  14
  15 /* constants */
  16
  17 //#define BUFFER_SIZE 4096
  18 #define BUFFER_SIZE 256
  19
  20 /* macros */
  21
  22 #define CEIL(x, y) (((x) + (y) - 1) / (y))
  23 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
  24 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
  25
  26 /* gobal variables */
  27
  28 char *progname = NULL;
  29
  30 /* help function */
  31
  32 int usage (int ret)
  33 {
  34     int fd = ret ? stdfderr : stdfdout;
  35     fdprintf (fd, "usage: %s\n", progname);
  36     fdprintf (fd, " -h : help message\n");
  37     fdprintf (fd, " -v : verbose level (%d)\n", verbose);
  38
  39     return ret;
  40 }
  41
  42 /* main function */
  43
  44 int main (int argc, char *argv[])
  45 {
  46     char buffer[BUFFER_SIZE + 1] = {0};
  47     char *pt = buffer;
  48     int i = 0, j = 0, n;
  49     int ret = 0;
  50
  51     /* program name */
  52
  53     progname = argv[0];
  54     while (progname[i] != '\0') {
  55         if ((progname[i] == '/') || (progname[i] == '\\')) {
  56             progname += i + 1;
  57             i = 0;
  58         } else {
  59             i++;
  60         }
  61     }
  62
  63     /* argument processing */
  64
  65      while (argc-- > 1) {
  66         char *arg = *(++argv);
  67         if (arg[0] != '-') {
  68             PRINTERR ("%s: invalid option -- %s\n", progname, arg);
  69             return usage (1);
  70         }
  71         char c = arg[1];
  72         switch (c) {
  73         case 'v':
  74             arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
  75             if (arg == NULL) {
  76                 PRINTERR ("%s: missing verbose level\n", progname);
  77                 return usage (1);
  78             }
  79             verbose = atoi (arg);
  80             break;
  81         case 'h':
  82         default:
  83             return usage (c != 'h');
  84         }
  85     }
  86
  87     /* read from input stream */
  88
  89     while ((n = read (stdfdin, pt, BUFFER_SIZE - (pt - buffer))) != 0) {
  90         VERBOSE (INFO, PRINTOUT ("read %d bytes\n", n));
  91         n += (pt - buffer);
  92         if ((n == 2) && (buffer[0] == '.')) {
  93             return 0;
  94         }
  95
  96         /* look for end of line */
  97         for (i = 0, j = 0; i < n; i++) {
  98             if (buffer[i] == '\n') {
  99                 buffer[i] = 0;
 100                 VERBOSE (INFO, PRINTOUT ("line(%d): %s\n", j, buffer + j));
 101                 element_t *element = parser (buffer + j, NULL, 0);
 102                 if (element == ERROR_OP) {
 103                     VERBOSE (WARNING, PRINTOUT ("error while parsing: %s\n", buffer));
 104                     ret = 1;
 105                         } else {
 106                     VERBOSE (INFO, print_element (element, 0));
 107                     PRINTOUT ("=> %f\n", evaluate_element (element, 0));
 108                     delelement (element);
 109                     ret = 0;
 110                 }
 111                 //fsync (stdfdout);
 112                 j = i + 1;
 113             }
 114         }
 115
 116         /* keep remainding */
 117         if (j < n) {
 118             for (i = 0; i < n - j; i++) {
 119                 buffer[i] = buffer[i + j];
 120             }
 121             pt = buffer + n - j;
 122             for (i = n - j; i < BUFFER_SIZE; i++) {
 123                 buffer[i] = 0;
 124             }
 125         }
 126     }
 127
 128     return ret;
 129 }
 130
 131 // test: calc.exe -h
 132 // test: calc.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
 133 // test: echo 1 | calc.exe -v3 | grep -q value
 134 // test: calc.exe -_ 2> /dev/null | awk 'END { if (NR == 0) { exit(0) } else exit (1) }'
 135 // test: calc.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
 136 // test: echo "1 + 2" | calc.exe | grep -q '=> 3'
 137 // test: echo "1 - 2" | calc.exe | grep -q '=> -1'
 138 // test: echo "2 * 3" | calc.exe | grep -q '=> 6'
 139 // test: echo "1 / 2" | calc.exe | grep -q '=> 5e-1'
 140 // test: echo "8 % 3" | calc.exe | grep -q '=> 2'
 141 // test: echo "-9 % 3.1" | calc.exe | grep -q '=> -2.8'
 142 // test: echo "2 ^ 3" | calc.exe | grep -q '=> 8'
 143 // test: echo "1e-1 + 2.34e3" | calc.exe | grep -q '=> 2.3401'
 144 // test: echo "sqrt (2)" | calc.exe | grep -q '=> 1.414213'
 145 // test: echo "pow (2, 3)" | calc.exe | grep -q '=> 8'
 146 // test: echo "cos (2)" | calc.exe | grep -q '=> -4.161468e-1'
 147 // test: echo "sin (2)" | calc.exe | grep -q '=> 9.092974e-1'
 148 // test: echo "atan (2)" | calc.exe | grep -q '=> 1.107148'
 149 // test: echo "exp (2)" | calc.exe | grep -q '=> 7.389056'
 150 // test: echo "log (2)" | calc.exe | grep -q '=> 6.931471e-1'
 151 // test: echo "2 + 3 - 4" | calc.exe | grep -q '=> 1'
 152 // test: echo "1 + cos (2 - 3)" | calc.exe | grep -q '=> 1.54030'
 153 // test: echo "cos (1 / 2) * 3" | calc.exe | grep -q '=> 2.63274'
 154 // test: echo "1 + 4 * (2 - 3)" | calc.exe | grep -q '=> -3'
 155 // test: echo "(2 - 3) / 4" | calc.exe | grep -q '=> -2.5e-1'
 156 // test: echo "pow (8 - 3, 4 / 3)" | calc.exe | grep -q '=> 8.549879'
 157 // test: echo "1 + -2" | calc.exe | grep -q '=> -1'
 158 // test: echo "1 - +2" | calc.exe | grep -q '=> -1'
 159 // test: echo "-1 + +2" | calc.exe | grep -q '=> 1'
 160 // test: echo "-1+2" | calc.exe | grep -q '=> 1'
 161 // test: echo "1-2" | calc.exe | grep -q '=> -1'
 162 // test: echo "1 * 2 / 3 + 4" | calc.exe | grep -q '=> 4.666666'
 163 // test: echo "2 ^ 3 * 4 + 5" | calc.exe | grep -q '=> 3.7e1'
 164 // test: echo "2 + 3 * 4 ^ 5" | calc.exe | grep -q '=> 3.074e3'
 165 // test: echo "2 ^ 3 * 4 + cos(5/6)" | calc.exe | grep -q '=> 3.267241e1'
 166 // test: echo "95-6.3*15-1" | calc.exe | grep -q '=> -5e-1'
 167 // test: echo "95 - 6.3 * 15 - 1" | calc.exe | grep -q '=> -5e-1'
 168 // test: echo "95-6.3+15" | calc.exe | grep -q '=> 1.037e2'
 169 // test: echo "-cos (0) + 1" | calc.exe | grep -q '=> 0'
 170 // test: echo "quit" | calc.exe | grep -q 'bye'
 171 // test: echo "help" | calc.exe | grep -q 'miscellaneous'
 172 // test: echo "1 + 2 *" | calc.exe | grep -q 'error'
 173 // test: echo "* 1 - 2" | calc.exe | grep -q 'error'
 174 // test: echo "2 + * 3" | calc.exe | grep -q 'error'
 175 // test: echo "sqrt 2" | calc.exe | grep -q 'error'
 176 // test: echo "pow (2)" | calc.exe | grep -q 'error'
 177
 178 /* vim: set ts=4 sw=4 et: */