303 lines
7.6 KiB
C
303 lines
7.6 KiB
C
#include "../include/shell.h"
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#include "../include/utils.h"
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#include "../include/input.h"
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/**
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* @brief Extracts command and its arguments from line
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*
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* @param line
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* @param args
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*/
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cmds_p *process_line(char *line)
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{
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int line_size = strlen(line);
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if (line_size < 1)
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return NULL;
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char *tmp = strdup(line), *free_tmp = tmp;
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cmds_p *coms = new_cmd();
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cmds_p *curr_cmd = coms;
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cmd_pipe *curr_pipe = curr_cmd->pipe;
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curr_pipe->pipefd[0] = STDIN_FILENO;
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for (int i = 0; i < line_size; i++)
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{
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if (line[i] == '"')
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{
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tmp++;
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i++;
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int j = i;
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for (; j < line_size; j++)
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if (line[j] == '"')
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{
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free_tmp[j] = '\0';
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append_to_str_arr(&(curr_pipe->args), &curr_pipe->args_am, trim_string(tmp, false));
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tmp += strlen(curr_pipe->args[curr_pipe->args_am - 1]) + 1;
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break;
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}
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if (j >= line_size)
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{
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char *ap_line = read_line();
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line = realloc(line, strlen(line) + strlen(ap_line) + 1);
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line = strcat(line, ap_line);
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line_size = strlen(line);
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free(ap_line);
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i--;
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continue;
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}
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i = j;
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if (tmp[0] == ' ')
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{
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tmp++;
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i++;
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}
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}
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else if (line[i] == ';' || (line[i] == '&' && line[i + 1] == '&') || (line[i] == '|' && line[i + 1] == '|'))
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{
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free_tmp[i] = '\0';
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if (line[i - 1] != ' ')
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{
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append_to_str_arr(&(curr_pipe->args), &curr_pipe->args_am, trim_string(tmp, false));
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tmp += strlen(curr_pipe->args[curr_pipe->args_am - 1]) + 1;
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}
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else
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tmp++;
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curr_pipe->args = realloc(curr_pipe->args, sizeof(char *) * (curr_pipe->args_am + 1));
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curr_pipe->args[curr_pipe->args_am] = NULL;
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switch (line[i])
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{
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case ';':
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curr_cmd->sep_next = SEMICOLON_SEP;
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break;
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case '&':
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curr_cmd->sep_next = AND_SEP;
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i++;
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tmp++;
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break;
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case '|':
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curr_cmd->sep_next = OR_SEP;
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i++;
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tmp++;
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break;
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}
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if (tmp[0] == ' ')
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{
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tmp++;
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i++;
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}
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if (curr_pipe->args[0] != NULL)
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{
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if (strcmp(curr_pipe->args[0], "!") == 0)
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{
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curr_cmd->stat.invert = true;
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}
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}
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cmds_p *next = new_cmd();
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curr_cmd->next = next;
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curr_cmd = curr_cmd->next;
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curr_pipe = curr_cmd->pipe;
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}
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else if (line[i] == '|')
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{
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if (line[i - 1] != ' ')
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{
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append_to_str_arr(&(curr_pipe->args), &curr_pipe->args_am, trim_string(tmp, false));
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tmp += strlen(curr_pipe->args[curr_pipe->args_am - 1]) + 1;
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}
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else
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tmp++;
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curr_pipe->args = realloc(curr_pipe->args, sizeof(char *) * (curr_pipe->args_am + 1));
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curr_pipe->args[curr_pipe->args_am] = NULL;
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if (tmp[0] == ' ')
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{
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tmp++;
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i++;
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}
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if (curr_pipe->args[0] != NULL)
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{
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if (strcmp(curr_pipe->args[0], "!") == 0)
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{
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curr_cmd->stat.invert = true;
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}
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}
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cmd_pipe *next = new_cmd_pipe();
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curr_pipe->next = next;
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curr_cmd->pipes_am++;
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curr_pipe = curr_pipe->next;
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}
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else if (line[i] == '>' || line[i] == '<')
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{
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int flags = 0;
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int f = 0;
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if (line[i] == '>' && line[i + 1] == '>')
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{
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flags = O_CREAT | O_APPEND | O_WRONLY;
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i++;
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tmp++;
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f = 0;
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}
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else if (line[i] == '>')
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{
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flags = O_CREAT | O_TRUNC | O_WRONLY;
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f = 0;
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}
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else if (line[i] == '<' && line[i + 1] == '>')
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{
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flags = O_CREAT | O_RDWR;
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i++;
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tmp++;
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f = 1;
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}
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else if (line[i] == '<')
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{
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flags = O_RDONLY;
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f = 2;
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}
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i++;
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tmp++;
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if (line[i] == ' ')
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{
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i++;
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tmp++;
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}
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int j = i;
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for (; j < line_size; j++)
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if (line[j] == ' ' || line[j] == '|' || line[j] == '&' || line[j] == ';')
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break;
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free_tmp[j] = '\0';
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if (tmp[0] == '"')
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tmp++;
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if (free_tmp[j - 1] == '"')
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free_tmp[j - 1] = '\0';
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int ffd;
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if ((ffd = open(tmp, flags)) < 0)
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{
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perror("file redirection: open");
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return NULL;
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}
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if (f == 0)
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curr_pipe->pipefd[1] = ffd;
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else if (f == 1)
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for (int k = 0; k < 2; k++)
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curr_pipe->pipefd[k] = ffd;
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else if (f == 2)
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curr_pipe->pipefd[0] = ffd;
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tmp += j - i + 1;
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i = j;
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}
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else if (line[i] == ' ')
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{
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free_tmp[i] = '\0';
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char *ap_string = trim_string(tmp, false), **exp = calloc(0, sizeof(char *));
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int sz = expand_wildcatrd(&exp, ap_string);
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for (int l = 0; l < sz; l++)
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append_to_str_arr(&(curr_pipe->args), &curr_pipe->args_am, exp[l]);
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tmp += strlen(ap_string) + 1;
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}
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else if (line[i] == '#')
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{
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break;
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}
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}
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if (tmp[0] != '\0' && tmp[0] != '#')
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{
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if (tmp[strlen(tmp) - 1] != '"')
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{
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char *ap_string = trim_string(tmp, false), **exp = calloc(0, sizeof(char *));
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int sz = expand_wildcatrd(&exp, ap_string);
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for (int l = 0; l < sz; l++)
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append_to_str_arr(&(curr_pipe->args), &curr_pipe->args_am, exp[l]);
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}
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else
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append_to_str_arr(&curr_pipe->args, &curr_pipe->args_am, trim_string(tmp, false));
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}
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if (curr_pipe->args[0] != NULL)
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{
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if (strcmp(curr_pipe->args[0], "!") == 0)
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{
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curr_cmd->stat.invert = true;
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}
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}
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free(free_tmp);
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if (curr_pipe->args[curr_pipe->args_am] != NULL)
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{
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curr_pipe->args = realloc(curr_pipe->args, sizeof(char *) * (curr_pipe->args_am + 1));
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curr_pipe->args[curr_pipe->args_am] = NULL;
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}
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if (curr_pipe->pipefd[1] < 0)
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curr_pipe->pipefd[1] = STDOUT_FILENO;
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return coms;
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}
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/**
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* @brief Expands wildcard in argument
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*
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* @param arr
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* @param input
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* @return int
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*/
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int expand_wildcatrd(char ***arr, char *input)
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{
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int size = 0;
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if (strchr(input, '*') || strchr(input, '~') || strchr(input, '?'))
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{
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glob_t globbuf;
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int t = glob(input, GLOB_TILDE, NULL, &globbuf);
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if (t != 0)
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perror("Glob");
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for (int j = 0; j < globbuf.gl_pathc; j++)
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append_to_str_arr(arr, &size, globbuf.gl_pathv[j]);
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}
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else
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append_to_str_arr(arr, &size, input);
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return size;
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} |