Annotation of src/usr.bin/make/lowparse.c, Revision 1.1
1.1 ! espie 1: /* $OpenBSD$ */
! 2:
! 3: /* low-level parsing functions. */
! 4:
! 5: /*
! 6: * Copyright (c) 1999,2000 Marc Espie.
! 7: *
! 8: * Extensive code changes for the OpenBSD project.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
! 20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
! 21: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
! 22: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
! 23: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
! 24: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
! 25: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 27: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
! 29: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 30: */
! 31:
! 32: #include <stdarg.h>
! 33: #include <stdio.h>
! 34: #include <assert.h>
! 35: #include "make.h"
! 36: #include "buf.h"
! 37: #include "lowparse.h"
! 38:
! 39: #ifdef CLEANUP
! 40: static LIST fileNames; /* file names to free at end */
! 41: #endif
! 42:
! 43: static LIST includes; /* stack of IFiles generated by
! 44: * #includes */
! 45:
! 46: static IFile *new_ifile __P((char *, FILE *));
! 47: static IFile *new_istring __P((char *, char *, unsigned long));
! 48: static void free_ifile __P((IFile *));
! 49: static void ParseVErrorInternal __P((char *, unsigned long, int, char *, va_list));
! 50: static int skiptoendofline __P((void));
! 51: static int ParseSkipEmptyLines __P((Buffer));
! 52: static int fatals = 0;
! 53:
! 54: /*-
! 55: * ParseVErrorInternal --
! 56: * Error message abort function for parsing. Prints out the context
! 57: * of the error (line number and file) as well as the message with
! 58: * two optional arguments.
! 59: *
! 60: * Side Effects:
! 61: * "fatals" is incremented if the level is PARSE_FATAL.
! 62: */
! 63: /* VARARGS */
! 64: static void
! 65: #ifdef __STDC__
! 66: ParseVErrorInternal(char *cfname, unsigned long clineno, int type, char *fmt,
! 67: va_list ap)
! 68: #else
! 69: ParseVErrorInternal(va_alist)
! 70: va_dcl
! 71: #endif
! 72: {
! 73: (void)fprintf(stderr, "\"%s\", line %lu: ", cfname, clineno);
! 74: if (type == PARSE_WARNING)
! 75: (void)fprintf(stderr, "warning: ");
! 76: (void)vfprintf(stderr, fmt, ap);
! 77: va_end(ap);
! 78: (void)fprintf(stderr, "\n");
! 79: if (type == PARSE_FATAL)
! 80: fatals ++;
! 81: }
! 82:
! 83: /*-
! 84: * Parse_Error --
! 85: * External interface to ParseVErrorInternal; uses the default filename
! 86: * Line number.
! 87: */
! 88: /* VARARGS */
! 89: void
! 90: #ifdef __STDC__
! 91: Parse_Error(int type, char *fmt, ...)
! 92: #else
! 93: Parse_Error(va_alist)
! 94: va_dcl
! 95: #endif
! 96: {
! 97: va_list ap;
! 98: #ifdef __STDC__
! 99: va_start(ap, fmt);
! 100: #else
! 101: int type; /* Error type (PARSE_WARNING, PARSE_FATAL) */
! 102: char *fmt;
! 103:
! 104: va_start(ap);
! 105: type = va_arg(ap, int);
! 106: fmt = va_arg(ap, char *);
! 107: #endif
! 108:
! 109: ParseVErrorInternal(current->fname, current->lineno, type, fmt, ap);
! 110: }
! 111:
! 112: static IFile *
! 113: new_ifile(name, stream)
! 114: char *name;
! 115: FILE *stream;
! 116: {
! 117: IFile *ifile;
! 118: #ifdef CLEANUP
! 119: Lst_AtEnd(&fileNames, name);
! 120: #endif
! 121:
! 122: ifile = emalloc(sizeof(*ifile));
! 123: ifile->fname = name;
! 124: /* Naturally enough, we start reading at line 0 */
! 125: ifile->lineno = 0;
! 126: ifile->F = stream;
! 127: ifile->ptr = ifile->end = NULL;
! 128: return ifile;
! 129: }
! 130:
! 131: static void
! 132: free_ifile(ifile)
! 133: IFile *ifile;
! 134: {
! 135: if (ifile->F)
! 136: (void)fclose(ifile->F);
! 137: else
! 138: free(ifile->str);
! 139: /* Note we can't free the file names yet, as they are embedded in GN for
! 140: * error reports. */
! 141: free(ifile);
! 142: }
! 143:
! 144: static IFile *
! 145: new_istring(str, name, lineno)
! 146: char *str;
! 147: char *name;
! 148: unsigned long lineno;
! 149: {
! 150: IFile *ifile;
! 151:
! 152: ifile = emalloc(sizeof(*ifile));
! 153: ifile->fname = name;
! 154: ifile->F = NULL;
! 155: /* Strings are used from for loops... */
! 156: ifile->lineno = lineno;
! 157: ifile->ptr = ifile->str = str;
! 158: ifile->end = str + strlen(str);
! 159: return ifile;
! 160: }
! 161:
! 162:
! 163: /*-
! 164: *---------------------------------------------------------------------
! 165: * Parse_FromString --
! 166: * Start Parsing from the given string
! 167: *
! 168: * Side Effects:
! 169: * A structure is added to the includes Lst and readProc, lineno,
! 170: * fname and curFILE are altered for the new file
! 171: *---------------------------------------------------------------------
! 172: */
! 173: void
! 174: Parse_FromString(str, lineno)
! 175: char *str;
! 176: unsigned long lineno;
! 177: {
! 178: if (DEBUG(FOR))
! 179: (void)fprintf(stderr, "%s\n----\n", str);
! 180:
! 181: if (current != NULL)
! 182: Lst_AtFront(&includes, current);
! 183: current = new_istring(str, current->fname, lineno);
! 184: }
! 185:
! 186:
! 187: void
! 188: Parse_FromFile(name, stream)
! 189: char *name;
! 190: FILE *stream;
! 191: {
! 192: if (current != NULL)
! 193: Lst_AtFront(&includes, current);
! 194: current = new_ifile(name, stream);
! 195: }
! 196:
! 197: /*-
! 198: *---------------------------------------------------------------------
! 199: * Parse_NextFile --
! 200: * Called when EOF is reached in the current file. If we were reading
! 201: * an include file, the includes stack is popped and things set up
! 202: * to go back to reading the previous file at the previous location.
! 203: *
! 204: * Results:
! 205: * CONTINUE if there's more to do. DONE if not.
! 206: *
! 207: * Side Effects:
! 208: * The old curFILE, is closed. The includes list is shortened.
! 209: * lineno, curFILE, and fname are changed if CONTINUE is returned.
! 210: *---------------------------------------------------------------------
! 211: */
! 212: Boolean
! 213: Parse_NextFile()
! 214: {
! 215: IFile *next;
! 216:
! 217: next = (IFile *)Lst_DeQueue(&includes);
! 218: if (next != NULL) {
! 219: if (current != NULL)
! 220: free_ifile(current);
! 221: current = next;
! 222: return TRUE;
! 223: } else
! 224: return FALSE;
! 225: }
! 226:
! 227:
! 228: int
! 229: newline()
! 230: {
! 231: size_t len;
! 232:
! 233: if (current->F) {
! 234: current->ptr = fgetln(current->F, &len);
! 235: if (current->ptr) {
! 236: current->end = current->ptr + len;
! 237: return *current->ptr++;
! 238: } else {
! 239: current->end = NULL;
! 240: }
! 241: }
! 242: return EOF;
! 243: }
! 244:
! 245: void
! 246: ParseUnreadc(c)
! 247: char c;
! 248: {
! 249: current->ptr--;
! 250: *current->ptr = c;
! 251: }
! 252:
! 253: unsigned long
! 254: Parse_Getlineno()
! 255: {
! 256: return current->lineno;
! 257: }
! 258:
! 259: const char *
! 260: Parse_Getfilename()
! 261: {
! 262: return current->fname;
! 263: }
! 264:
! 265: #ifdef CLEANUP
! 266: void
! 267: LowParse_Init()
! 268: {
! 269: Lst_Init(&includes);
! 270: current = NULL;
! 271: }
! 272:
! 273: void
! 274: LowParse_End()
! 275: {
! 276: Lst_Destroy(&includes, NOFREE); /* Should be empty now */
! 277: }
! 278: #endif
! 279:
! 280:
! 281: void
! 282: Finish_Errors()
! 283: {
! 284: if (current != NULL) {
! 285: free_ifile(current);
! 286: current = NULL;
! 287: }
! 288: if (fatals) {
! 289: fprintf(stderr, "Fatal errors encountered -- cannot continue\n");
! 290: exit(1);
! 291: }
! 292: }
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