libjulius/src/m_jconf.c

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/*
 * Copyright (c) 1991-2007 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2007 Julius project team, Nagoya Institute of Technology
 * All rights reserved
 */

#include <julius/julius.h>

#if defined(_WIN32) && !defined(__CYGWIN32__)
#include <mbstring.h>
#endif

#define ISTOKEN(A) (A == ' ' || A == '\t' || A == '\n') ///< Determine token characters

/* added by H.Banno for Windows & Mac */
static char *
fgets_jconf(char *buf, int size, FILE *fp)
{
  int c, prev_c;
  int pos;

  if (fp == NULL) return NULL;
    
  pos = 0;
  c = '\0';
  prev_c = '\0';
  while (1) {
    if (pos >= size) {
      pos--;
      break;
    }

    c = fgetc(fp);
    if (c == EOF) {
      buf[pos] = '\0';
      if (pos <= 0) {
        return NULL;
      } else {
        return buf;
      }
    } else if (c == '\n' || c == '\r') {
      if (c == '\r' && (c = fgetc(fp)) != '\n') { /* for Mac */
        ungetc(c, fp);
      }
      if (prev_c == '\\') {
        pos--;
      } else {
        break;
      }
    } else {
      buf[pos] = c;
      pos++;

#if defined(_WIN32) && !defined(__CYGWIN32__)
      if (c == '\\' && (_ismbblead(prev_c) && _ismbbtrail(c))) {
      c = '\0';
      }
#endif
    }
    prev_c = c;
  }
  buf[pos] = '\0';

  return buf;
}

void
get_dirname(char *path)
{
  char *p;
  /* /path/file -> /path/ */
  /* path/file  -> path/  */
  /* /file      -> / */
  /* file       ->  */
  /* ../file    -> ../ */
  p = path + strlen(path) - 1;
  while (*p != '/'
#if defined(_WIN32) && !defined(__CYGWIN32__)
         && *p != '\\'
#endif
         && p != path) p--;
  if (p == path && *p != '/') *p = '\0';
  else *(p+1) = '\0';
}

static char *
expand_env(char *str)
{
  char *p, *q;
  char *bgn;
  char eb;
  char *target;
  char *envval;
  int target_malloclen;
  int len, n;
  boolean inbrace;
  char env[256];

  /* check if string contains '$' and return immediately if not */
  /* '$' = 36, '\'' = 39 */
  p = str;
  inbrace = FALSE;
  while (*p != '\0') {
    if (*p == 39) {
      if (inbrace == FALSE) {
        inbrace = TRUE;
      } else {
        inbrace = FALSE;
      }
      p++;
      continue;
    }
    if (! inbrace) {
      if (*p == '\\') {
        p++;
        if (*p == '\0') break;
      } else {
        if (*p == 36) break;
      }
    }
    p++;
  }
  if (*p == '\0') return str;

  /* prepare result buffer */
  target_malloclen = strlen(str) * 2;
  target = (char *)mymalloc(target_malloclen);

  p = str;
  q = target;

  /* parsing */
  inbrace = FALSE;
  while (*p != '\0') {

    /* look for next '$' */
    while (*p != '\0') {
      if (*p == 39) {
        if (inbrace == FALSE) {
          inbrace = TRUE;
        } else {
          inbrace = FALSE;
        }
        p++;
        continue;
      }
      if (! inbrace) {
        if (*p == '\\') {
          p++;
          if (*p == '\0') break;
        } else {
          if (*p == 36) break;
        }
      }
      *q = *p;
      p++;
      q++;
      n = q - target;
      if (n >= target_malloclen) {
        target_malloclen *= 2;
        target = myrealloc(target, target_malloclen);
        q = target + n;
      }
    }
    if (*p == '\0') {           /* reached end of string */
      *q = '\0';
      break;
    }

    /* move to next */
    p++;

    /* check for brace */
    eb = 0;
    if (*p == '(') {
      eb = ')';
    } else if (*p == '{') {
      eb = '}';
    }

    /* proceed to find env end point and set the env string to env[] */
    if (eb != 0) {
      p++;
      bgn = p;
      while (*p != '\0' && *p != eb) p++;
      if (*p == '\0') {
        jlog("ERROR: failed to expand variable: no end brace: \"%s\"\n", str);
        free(target);
        return str;
      }
    } else {
      bgn = p;
      while (*p == '_'
             || (*p >= '0' && *p <= '9')
             || (*p >= 'a' && *p <= 'z')
             || (*p >= 'A' && *p <= 'Z')) p++;
    }
    len = p - bgn;
    if (len >= 256 - 1) {
      jlog("ERROR: failed to expand variable: too long env name: \"%s\"\n", str);
      free(target);
      return str;
    }
    strncpy(env, bgn, len);
    env[len] = '\0';

    /* get value */
    if ((envval = getenv(env)) == NULL) {
      jlog("ERROR: failed to expand variable: no such variable \"%s\"\n", env);
      free(target);
      return str;
    }

    if (debug2_flag) {          /* for debug */
      jlog("DEBUG: expand $%s to %s\n", env, envval);
    }

    /* paste value to target */
    while(*envval != '\0') {
      *q = *envval;
      q++;
      envval++;
      n = q - target;
      if (n >= target_malloclen) {
        target_malloclen *= 2;
        target = myrealloc(target, target_malloclen);
        q = target + n;
      }
    }

    /* go on to next */
    if (eb != 0) p++;
  }

  free(str);
  return target;
}

/* read-in and parse jconf file and process those using m_options */
boolean
config_file_parse(char *conffile, Jconf *jconf)
{
  int c_argc;
  char **c_argv;
  FILE *fp;
  int maxnum, step;
#define BUFLEN 512
  char buf[BUFLEN], cpy[BUFLEN];
  char *p, *dst, *dst_from;
  char *cdir;
  int i;
  boolean ret;

  jlog("STAT: include config: %s\n", conffile);
  
  /* set the content of jconf file into argument list c_argv[1..c_argc-1] */
  /* c_argv[0] will be the original conffile name */
  /* inside jconf file, quoting by ", ' and escape by '\' is supported */
  if ((fp = fopen(conffile, "r")) == NULL) {
    jlog("ERROR: m_jconf: failed to open jconf file: %s\n", conffile);
    return FALSE;
  }
  step = 20;
  maxnum = step;
  c_argv = (char **)mymalloc(sizeof(char *) * maxnum);
  c_argv[0] = strcpy((char *)mymalloc(strlen(conffile)+1), conffile);
  c_argc = 1;
  while (fgets_jconf(buf, BUFLEN, fp) != NULL) {
    if (buf[0] == '\0') continue;
    p = buf; dst = cpy;
    while (1) {
      while (*p != '\0' && ISTOKEN(*p)) p++;
      if (*p == '\0') break;
      
      dst_from = dst;
      
      while (*p != '\0' && (!ISTOKEN(*p))) {
        if (*p == '\\') {     /* escape by '\' */
          if (*(++p) == '\0') break;
          *(dst++) = *(p++);
        } else {
          if (*p == '"') { /* quote by "" */
            p++;
            while (*p != '\0' && *p != '"') *(dst++) = *(p++);
            if (*p == '\0') break;
            p++;
          } else if (*p == '\'') { /* quote by '' */
            p++;
            while (*p != '\0' && *p != '\'') *(dst++) = *(p++);
            if (*p == '\0') break;
            p++;
          } else if (*p == '#') { /* comment out by '#' */
            *p = '\0';
            break;
          } else {              /* other */
            *(dst++) = *(p++);
          }
        }
      }
      if (dst != dst_from) {
        *dst = '\0'; dst++;
        if (c_argc >= maxnum) {
          maxnum += step;
          c_argv = (char **)myrealloc(c_argv, sizeof(char *) * maxnum);
        }
        c_argv[c_argc++] = strcpy((char*)mymalloc(strlen(dst_from)+1), dst_from);
      }
    }
  }
  if (fclose(fp) == -1) {
    jlog("ERROR: m_jconf: cannot close jconf file\n");
    return FALSE;
  }

  /* env expansion */
  for (i=1;i<c_argc;i++) {
    c_argv[i] = expand_env(c_argv[i]);
  }

  if (debug2_flag) {            /* for debug */
    jlog("DEBUG: args:");
    for (i=1;i<c_argc;i++) jlog(" %s",c_argv[i]);
    jlog("\n");
  }

  /* now that options are in c_argv[][], call opt_parse() to process them */
  /* relative paths in jconf file are relative to the jconf file (not current) */
  cdir = strcpy((char *)mymalloc(strlen(conffile)+1), conffile);
  get_dirname(cdir);
  ret = opt_parse(c_argc, c_argv, (cdir[0] == '\0') ? NULL : cdir, jconf);
  free(cdir);

  /* free arguments */
  while (c_argc-- > 0) {
    free(c_argv[c_argc]);
  }
  free(c_argv);

  return(ret);
}

/* end of file */