blc_command.cpp 9.72 KB
Newer Older
Arnaud Blanchard's avatar
Arnaud Blanchard committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
/* Basic Library for C/C++ (blclib)
 Copyright  ETIS — ENSEA, Université de Cergy-Pontoise, CNRS (2011 - 2014)
 
 Author:  Arnaud Blanchard
 
 This software is governed by the CeCILL v2.1 license under French law and abiding by the rules of distribution of free software.
 You can use, modify and/ or redistribute the software under the terms of the CeCILL v2.1 license as circulated by CEA, CNRS and INRIA at the following URL "http://www.cecill.info".
 As a counterpart to the access to the source code and  rights to copy, modify and redistribute granted by the license,
  users are provided only with a limited warranty and the software's author, the holder of the economic rights,  and the successive licensors have only limited liability.
  In this respect, the user's attention is drawn to the risks associated with loading, using, modifying and/or developing or reproducing the software by the user in light of its specific status of free software,
  that may mean  that it is complicated to manipulate, and that also therefore means that it is reserved for developers and experienced professionals having in-depth computer knowledge.
 Users are therefore encouraged to load and test the software's suitability as regards their requirements in conditions enabling the security of their systems and/or data to be ensured
  and, more generally, to use and operate it in the same conditions as regards security.
  The fact that you are presently reading this means that you have had knowledge of the CeCILL v2.1 license and that you accept its terms. */

#include "blc_command.h"
#include "blc_realtime.h" //us_

#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include <termios.h>
#include <getopt.h>
#include <signal.h>
#include <errno.h> //errno and EINT
#include <libgen.h> //basename
#include <unistd.h> //usleep
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/select.h>

#include "blc_text.h"
#include "blc_tools.h"
#include "blc_program.h"


//Identical to argparse in Python
#define POSITIONAL_ARGUMENTS_TITLE "\npositional arguments:\n"
#define OPTIONAL_ARGUMENTS_TITLE "\noptional arguments:\n"

typedef void*(*type_pthread_cb)(void*);

typedef struct
{
    const char *name;
    type_blc_command_cb callback;
    const char *prompt;
    const char *help;
    void *user_data;
}blc_command;

52

Arnaud Blanchard's avatar
Arnaud Blanchard committed
53
54
55
56
// Static means it is only existing in this file
static blc_command *blc_commands = NULL;
static int blc_commands_nb = 0;

57
58
59
static sem_t *sems_to_unlock=NULL;
static int sems_to_unlock_nb=0;

60

61
62
63
64
65
66

void blc_loop_sem_to_unlock_on_stop(void *sem){
 
    APPEND_ITEM(&sems_to_unlock, &sems_to_unlock_nb, &sem);
}

Arnaud Blanchard's avatar
Arnaud Blanchard committed
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
START_EXTERN_C

void blc_command_display_help()
{
    const blc_command *command;
    size_t command_length_max = 0;
    size_t command_length=0;
    
    FOR_EACH(command, blc_commands, blc_commands_nb)
    {
        command_length = strlen(command->name);
        if (command->prompt) command_length+=strlen(command->prompt)+2;
        command_length_max = MAX(command_length, command_length_max);
    }
    
    FOR_EACH(command, blc_commands, blc_commands_nb)
    {
        if (command->prompt) fprintf(stderr, "%s<%s>%*c:%s\n", command->name, command->prompt, (int)(command_length_max - strlen(command->name)-strlen(command->prompt)-1), ' ', command->help);
        else    fprintf(stderr, "%-*s :%s\n", (int)command_length_max, command->name, command->help);
    }
}

void blc_command_add(const char *command_name, type_blc_command_cb callback, const char *prompt, const char *help, void *user_data){
    blc_command tmp_command;
    int i;
    
    tmp_command.name = command_name;
    tmp_command.callback = callback;
    tmp_command.prompt = prompt;
    tmp_command.help = help;
    tmp_command.user_data = user_data;
    
    FOR_INV(i, blc_commands_nb)
100
    if (strcmp(blc_commands[i].name, command_name) == 0) EXIT_ON_ERROR("%s: command '%s' is already defined.", blc_program_name,  command_name);
Arnaud Blanchard's avatar
Arnaud Blanchard committed
101
102
103
    
    APPEND_ITEM(&blc_commands, &blc_commands_nb, &tmp_command);
}
104

105
106
107
108
109
110
111
112
113
114
115
116

void blc_command_remove(const char *command_name){
    int i;
    
    FOR_INV(i, blc_commands_nb){
        if (strcmp(blc_commands[i].name, command_name) == 0) break;
    }
    if (i==-1) EXIT_ON_ERROR("You try to remove a command '%s' that does not exist", command_name);

    REMOVE_ITEM(&blc_commands, &blc_commands_nb, i);
}

117
void blc_command_interpret_string(char const *input_string, size_t size){
118
119
120
121
    char const*parameter;
    char *parameter2;
    
    size_t parameter_size, parameter2_size;
122
123
    const blc_command *command;
    size_t name_size, line_capability=0;
Arnaud Blanchard's avatar
Arnaud Blanchard committed
124
    
125
    FOR_EACH(command, blc_commands, blc_commands_nb){
Arnaud Blanchard's avatar
Arnaud Blanchard committed
126
        name_size = strlen(command->name);
127
        if (strncmp(command->name, input_string, name_size) == 0){
128
129
            parameter = input_string + name_size;
            parameter_size = size - name_size;
130
            if (parameter_size == 0){ //No text after the command
131
                parameter2 = NULL;
132
                if ((command->prompt != NULL) && (command->prompt[0]!='|')) {//A text was expected
Arnaud Blanchard's avatar
Arnaud Blanchard committed
133
                    fprintf(stderr, "%s:", command->prompt);
134
135
                    parameter2_size = getline(&parameter2, &line_capability, stdin)-1;
                    parameter2[parameter2_size]=0;
Arnaud Blanchard's avatar
Arnaud Blanchard committed
136
                }
137
138
                if (command->callback == NULL) EXIT_ON_ERROR("Command callback is NULL for command '%s'", command->name);
                command->callback(parameter2, command->user_data);
139
                FREE(parameter2);
Arnaud Blanchard's avatar
Arnaud Blanchard committed
140
                line_capability=0;
141
                break; //Command has been found
Arnaud Blanchard's avatar
Arnaud Blanchard committed
142
            }
143
            else{
144
145
146
147
148
149
150
151
152
                //A parameter was expected
                if (command->prompt)   {
                    command->callback(parameter, command->user_data);
                    break;
                }
                else continue; //Maybe it is a command with a longer name, we continue to check
            /*    if ((command->prompt != NULL) && (command->prompt[0]!='|')) continue; // If we do not wait for parameter, the command must be exact.
                else
                return;*/
Arnaud Blanchard's avatar
Arnaud Blanchard committed
153
154
155
            }
        }
    }
156
    if (command == blc_commands+blc_commands_nb) fprintf(stderr, "%s: unknown command in: '%s'\n", blc_program_name,  input_string);
157
158
}

159
void blc_command_interpret_block(){
160
161
162
163
    char *line=NULL;
    size_t line_capability=0;
    ssize_t line_size;
    
164
    //We do not consider error if it was an interruption. @TODO check wether the content of lin is correct.
165
166
167
168
169
170
    do{
        line_size = getline(&line, &line_capability, stdin);
    }while ((line_size==-1) && (errno==EINTR));
    
    if (line_size==-1)
    {
171
172
        if ((errno==0) || (errno==ETIMEDOUT) || (errno==EINVAL)) {
            if (line) FREE(line);
173
174
            blc_command_ask_quit(); //stdin closed
        }
175
        else EXIT_ON_SYSTEM_ERROR("getline(&line, &line_capability, stdin)");
176
177
178
179
180
181
    }
    else{
        line_size=line_size-1;
        line[line_size]=0; // Removing the last return char (\n)
        blc_command_interpret_string(line, line_size);
    }
182
    FREE(line);
Arnaud Blanchard's avatar
Arnaud Blanchard committed
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
}

void blc_command_interpret(){
    fd_set rfds;
    int retval=-1;
    
    /* Surveiller stdin (fd 0) en attente d'entrées */
    FD_ZERO(&rfds);
    FD_SET(0, &rfds);
    
    //Block until there is data or there is an interuption (Ctrl+C, Terminate, ..)  which is not the case with getline.
    while (retval==-1){
        retval = select(1, &rfds, NULL, NULL, NULL);
        if (retval!=-1) blc_command_interpret_block();
        else if (errno!=EINTR) EXIT_ON_SYSTEM_ERROR("Waiting to interpret a command");
    }
}

int blc_command_try_to_interpret(){
    fd_set rfds;
    struct timeval time_val={0,0};
    int retval;
    
    /* Surveiller stdin (fd 0) en attente d'entrées */
    FD_ZERO(&rfds);
    FD_SET(STDIN_FILENO, &rfds);
    
    SYSTEM_ERROR_CHECK(retval = select(STDIN_FILENO+1, &rfds, NULL, NULL, &time_val), -1, NULL);
    if (retval) blc_command_interpret_block();
    else return 0;
    
    return 1;
}

217
/*
Arnaud Blanchard's avatar
Arnaud Blanchard committed
218
219
void blc_command_interpret_thread(char const *option, void (*ask_quit_funcion)()){
    pthread_t thread;
220
    
Arnaud Blanchard's avatar
Arnaud Blanchard committed
221
222
    if (ask_quit_funcion==NULL) ask_quit_funcion=blc_command_ask_quit;
    blc_command_loop_period=-2;
223
224
    if (strchr(option, 'h')) blc_command_add("h",  (type_blc_command_cb)blc_command_display_help, NULL, "display this help", NULL);
    if (strchr(option, 'q')) blc_command_add("q",  (type_blc_command_cb)ask_quit_funcion, NULL, "quit the application", NULL);
Arnaud Blanchard's avatar
Arnaud Blanchard committed
225
    SYSTEM_ERROR_CHECK(pthread_create(&thread, NULL, command_thread_interpret_loop, NULL), -1, NULL);
226
}*/
Arnaud Blanchard's avatar
Arnaud Blanchard committed
227
228
229
230
231
232
233

void blc_command_update_int_cb(char const *argument, void *int_pt){
    char *endptr;
    int value;
    
    if (argument==NULL || argument[0]==0) fprintf(stderr, "%d\n", *(int*)int_pt);
    else{
234
235
236
        value=strtod(argument, &endptr);
        if (endptr!=argument+strlen(argument)) fprintf(stderr, "Error reading '%s' as an int. The value is still:%d\n", argument,  *(int*)int_pt);
        else *(int*)int_pt=value;
Arnaud Blanchard's avatar
Arnaud Blanchard committed
237
238
239
240
241
242
243
244
245
    }
}

void blc_command_update_float_cb(char const *argument, void *float_pt){
    char *endptr;
    float value;
    
    if (argument==NULL || argument[0]==0) fprintf(stderr, "%f\n", *(float*)float_pt);
    else{
246
247
248
        value=strtof(argument, &endptr);
        if (endptr!=argument+strlen(argument)) fprintf(stderr, "Error reading '%s' as a float. The value is still:%f\n", argument,  *(float*)float_pt);
        else *(float*)float_pt=value;
Arnaud Blanchard's avatar
Arnaud Blanchard committed
249
250
251
252
253
254
255
256
257
    }
}

void blc_command_update_double_cb(char const *argument, void *double_pt){
    char *endptr;
    double value;
    
    if (argument==NULL || argument[0]==0) fprintf(stderr, "%lf\n", *(double*)double_pt);
    else{
258
259
260
        value=strtod(argument, &endptr);
        if (endptr!=argument+strlen(argument)) fprintf(stderr, "Error reading '%s' as a double. The value is still:%lf\n", argument,  *(double*)double_pt);
        else *(double*)double_pt=value;
Arnaud Blanchard's avatar
Arnaud Blanchard committed
261
262
263
264
265
    }
}


END_EXTERN_C