my-os-project2/user/tb/interp.c

#include <stddef.h>
#include <stdbool.h>
#include <ulib.h>
#include "interp.h"
#include "runtime.h"
#include "macros.h"

extern uint64_t PID;

static InterpResult RES;

void tz_init(Tokenizer *tz, char *str) {
  tz->str = str;
  tz->tokens = NULL;
}

void tz_free(Tokenizer *tz) {
  Token *tk, *tktmp;
  LL_FOREACH_SAFE(tz->tokens, tk, tktmp) {
    ufree(tk->str);
    ufree(tk);
  }
  tz->tokens = NULL;
}

#define TZ_MAX_TK 1024

void tz_tokenize(Tokenizer *tz) {
  size_t len = string_len(tz->str);
  for (size_t i = 0; i < len; i++) {
    if (tz->str[i] == '\'') {
      char *str = umalloc(TZ_MAX_TK);
      string_memset(str, 0, TZ_MAX_TK);
      i++;
      size_t j = 0;
      while (i < len && tz->str[i] != '\'') {
        str[j++] = tz->str[i++];
      }
      Token *tk = umalloc(sizeof(*tk));
      tk->str = str;
      tk->next = NULL;
      LL_APPEND(tz->tokens, tk);
    } else {
      char *tkstr = umalloc(TZ_MAX_TK);
      string_memset(tkstr, 0, TZ_MAX_TK);
      size_t j = 0;
      while (i < len && !string_chr_isspace(tz->str[i])) {
        tkstr[j++] = tz->str[i++];
      }
      Token *tk = umalloc(sizeof(*tk));
      tk->str = tkstr;
      tk->next = NULL;
      LL_APPEND(tz->tokens, tk);
    }
  }
}

void tz_classify(Tokenizer *tz) {
  Token *tk, *tktmp;
  LL_FOREACH_SAFE(tz->tokens, tk, tktmp) {
    if (tk->str[0] == '"') {
      tk->type = TOK_STRING;
    } else if (tk->str[0] == '%') {
      RtCmd *cmd, *cmdtmp;
      LL_FOREACH_SAFE(RTCMDS, cmd, cmdtmp) {
        if (string_strcmp(tk->str, cmd->cmdname) == 0) {
          tk->type = TOK_CMD;
          tk->cmd = cmd;
          break;
        }
      }
    } else {
      tk->type = TOK_MISC;
    }
  }
}

void tz_expandspecial(Tokenizer *tz) {
  Token *tk, *tktmp;
  LL_FOREACH_SAFE(tz->tokens, tk, tktmp) {
    if (tk->str[0] == '$' && string_len(tk->str) > 1) {
      RtAlias *alias, *aliastmp;
      LL_FOREACH_SAFE(RTALIASES, alias, aliastmp) {
        if (string_strcmp(alias->namebuf, tk->str) == 0) {
          ufree(tk->str);
          size_t len = string_len(alias->valbuf)+1;
          tk->str = umalloc(len);
          string_memset(tk->str, 0, len);
          string_memcpy(tk->str, alias->valbuf, string_len(alias->valbuf));
          break;
        }
      }
    }
  }
}

#define LINE_MAX 1024

bool interp_runstring(char *string, InterpResult **res, bool logcmds, bool interactive) {
  *res = &RES;
  string_memset(RES.errmsg, 0, sizeof(RES.errmsg));

  rt_init();
  bool ok = true;
  
  char *line = string_tokenizealloc(string, "\n");
  while (line != NULL) {
    if (logcmds) {
      uprintf("+%s\n", line);
    }

    Tokenizer tz; ZERO(&tz);
    tz_init(&tz, line);

    tz_tokenize(&tz);
    
    tz_classify(&tz);
    tz_expandspecial(&tz);

    Token *cmdtk = tz.tokens;
    if (cmdtk->type == TOK_CMD) {
      ok = cmdtk->cmd->fn(cmdtk->next);
      if (!ok) {
        usprintf(RES.errmsg, "cmd %s failed", cmdtk->str);
        goto next;
      }
    } else if (cmdtk->type == TOK_MISC) {
      size_t argslen1;
      Token *argtk, *argtktmp;
      LL_FOREACH_SAFE_IDX(cmdtk->next, argtk, argtktmp, argslen1);
      
      size_t i;
      char **args1 = (char **)umalloc(sizeof(char *) * argslen1);
      LL_FOREACH_SAFE_IDX(cmdtk->next, argtk, argtktmp, i) {
        args1[i] = (char *)umalloc(PROC_ARG_MAX);
        string_memset(args1[i], 0, PROC_ARG_MAX);
        string_memcpy(args1[i], argtk->str, MIN(string_len(argtk->str), PROC_ARG_MAX));
      }

      int32_t app = processctl(-1, PCTL_SPAWN, (uint64_t)cmdtk->str, (uint64_t)args1, argslen1);
      if (app < 0) {
        usprintf(RES.errmsg, "Could not run %s: %s\n", cmdtk->str, ERRSTRING(app));
        ok = false;
        goto cleanup;
      }

      processctl(app, PCTL_RUN, 0, 0, 0);

      uint8_t b;
      while(processctl(app, PCTL_POLLSTATE, 0, 0, 0) != 4) {
        if (interactive) {
          int32_t nrd = ipcpipe(PID, IPCPIPE_IN, IPCPIPE_READ, &b, 1);
          if (nrd > 0 && b == C('S')) {
            processctl(app, PCTL_KILL, 0, 0, 0);
            goto cleanup;
          }
        }
        schedrelease();
      }

      cleanup: {
        for (size_t j = 0; j < argslen1; j++) ufree(args1[j]);
        ufree(args1);
      }
    }

next:
    tz_free(&tz);
    ufree(line);
    line = string_tokenizealloc(NULL, "\n");
  }

done:
  return ok;
}