100 lines
No EOL
2.9 KiB
C
100 lines
No EOL
2.9 KiB
C
#include <pland/pcrt.h>
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#include <knob/block.h>
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#include <knob/task.h>
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#include <knob/user.h>
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#include "cmds.h"
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#include "vars.h"
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#define LINE_SIZE 4096
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static char line[LINE_SIZE];
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static void line_replace(const char *from) {
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const char *fi = from;
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char *ti = line;
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while (*fi) {
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if (ti == line + LINE_SIZE) {
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tell_user_sz("Line too long.\n");
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line[0] = '\0';
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return;
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}
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if (*fi != '$') {
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*ti = *fi;
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++ti;
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++fi;
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continue;
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}
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const char *var_start = ++fi;
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const char *var_end = var_start;
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while (*var_end != '$')
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if (!*var_end++) {
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tell_user_sz("Unterminated variable name.\n");
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line[0] = '\0';
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return;
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}
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if (ti + (var_end - var_start) >= line + LINE_SIZE) {
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tell_user_sz("Line too long.\n");
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line[0] = '\0';
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return;
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}
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struct no_null_sn vname = {
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.data = var_start,
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.length = var_end - var_start
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};
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const struct no_null_sn *vval = get_var(vname);
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if (!vval)
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vval = &vname;
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blockcpy(ti, vval->data, vval->length);
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ti += vval->length;
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fi = var_end + 1;
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}
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*ti = '\0';
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}
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void run_line(const char *original_line) {
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line_replace(original_line);
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if (!*line)
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return;
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const char *space;
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for (space = line; *space && (*space != ' '); ++space)
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;
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if (blockequ(line, "source", space - line))
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source(space + 1);
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else if (blockequ(line, "set", space - line))
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set(space + 1);
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else if (blockequ(line, "echo", space - line)) {
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tell_user_sz(space + 1);
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tell_user_sz("\n");
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}
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else if (blockequ(line, "vars", space - line))
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dump_vars();
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else if (blockequ(line, "quit", space - line))
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__pcrt_quit();
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else if (blockequ(line, "help", space - line))
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tell_user_sz("Highway is a command shell for Portland OS. It includes variables and a couple\n"
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"of pseudo-commands. Variables are addressed by surrounding with \"$\". The\n"
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"following list shows each of the pseudo-commands.\n\n"
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" source FILE run each command in FILE\n"
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" set VAR VALUE set $VAR$ to VALUE\n"
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" echo STRING print STRING\n"
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" vars dump variables\n"
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" quit exit highway\n"
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" help show this\n");
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else if (!try_run_command_blocking(line)) {
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struct no_null_sn arg = {
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.data = "_path",
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.length = 5
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};
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const struct no_null_sn *path = get_var(arg);
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if (!path->length) {
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tell_user_sz("Could not run command.\n");
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return;
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}
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for (uint16_t to_i = LINE_SIZE - 1; to_i >= path->length; --to_i)
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line[to_i] = line[to_i - path->length];
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blockcpy(line, path->data, path->length);
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if (!try_run_command_blocking(line)) {
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tell_user_sz("Could not run command.\n");
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return;
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}
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}
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} |