399 lines
9.2 KiB
C
399 lines
9.2 KiB
C
/*
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Copyright (c) 1990-2000 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2000-Apr-09 or later
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(the contents of which are also included in zip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/*
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This file implements the getenv() function.
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# Background:
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# Under Unix: Each Process (= running Program) has a set of
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# associated variables. The variables are called enviroment
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# variables and, together, constitute the process environment.
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# These variables include the search path, the terminal type,
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# and the user's login name.
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# Unfortunatelly the MacOS has no equivalent. So we need
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# a file to define the environment variables.
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# Name of this file is "MacZip.Env". It can be placed
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# in the current folder of MacZip or in the
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# preference folder of the system disk.
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# If MacZip founds the "MacZip.Env" file in the current
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# the folder of MacZip the "MacZip.Env" file in the
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# preference folder will be ignored.
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# An environment variable has a name and a value:
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# Name=Value
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# Note: Spaces are significant:
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# ZIPOPT=-r and
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# ZIPOPT = -r are different !!!
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*/
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/*****************************************************************************/
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/* Includes */
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/*****************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unix.h>
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#include <Files.h>
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#include <Folders.h>
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#include "pathname.h"
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#include "helpers.h"
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/*****************************************************************************/
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/* Module level Vars */
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/*****************************************************************************/
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static char ListAllKeyValues = 0;
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static unsigned LineNumber = 0;
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static char CompletePath[NAME_MAX];
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Boolean IgnoreEnvironment = false; /* used by dialog.c and initfunc.c
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of the Mainapp */
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/*****************************************************************************/
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/* Macros, typedefs */
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/*****************************************************************************/
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typedef struct _EnviromentPair {
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char *key;
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char *value;
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} EnviromentPair;
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#define MAX_COMMAND 1024
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/*****************************************************************************/
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/* Prototypes */
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/*****************************************************************************/
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int get_char(FILE *file);
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void unget_char(int ch,FILE *file);
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int get_string(char *string,int size, FILE *file, char *terms);
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void skip_comments(FILE *file);
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char *load_entry(FILE *file);
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char *getenv(const char *name);
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EnviromentPair *ParseLine(char *line);
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OSErr FSpFindFolder_Name(short vRefNum, OSType folderType,
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Boolean createFolder,FSSpec *spec, unsigned char *name);
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FILE * FSp_fopen(ConstFSSpecPtr spec, const char * open_mode);
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void ShowAllKeyValues(void);
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void Set_LineNum(unsigned ln);
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/*****************************************************************************/
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/* Functions */
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/*****************************************************************************/
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/* get_string(str, max, file, termstr) : like fgets() but
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* (1) has terminator string which should include \n
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* (2) will always leave room for the null
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* (3) uses get_char() so LineNumber will be accurate
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* (4) returns EOF or terminating character, whichever
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*/
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int get_string(char *string, int size, FILE *file, char *terms)
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{
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int ch;
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while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) {
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if (size > 1) {
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*string++ = (char) ch;
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size--;
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}
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}
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if (size > 0)
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{
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*string = '\0';
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}
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return ch;
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}
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void Set_LineNum(unsigned ln)
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{
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LineNumber = ln;
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}
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/* get_char(file) : like getc() but increment LineNumber on newlines
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*/
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int get_char(FILE *file)
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{
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int ch;
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ch = getc(file);
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if (ch == '\n')
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{
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Set_LineNum(LineNumber + 1);
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}
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return ch;
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}
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/* skip_comments(file) : read past comment (if any)
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*/
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void skip_comments(FILE *file)
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{
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int ch;
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while (EOF != (ch = get_char(file)))
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{
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/* ch is now the first character of a line.
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*/
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while (ch == ' ' || ch == '\t')
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{
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ch = get_char(file);
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}
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if (ch == EOF)
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{
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break;
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}
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/* ch is now the first non-blank character of a line.
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*/
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if (ch != '\n' && ch != '#')
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{
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break;
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}
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/* ch must be a newline or comment as first non-blank
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* character on a line.
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*/
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while (ch != '\n' && ch != EOF)
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{
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ch = get_char(file);
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}
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/* ch is now the newline of a line which we're going to
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* ignore.
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*/
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}
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if (ch != EOF)
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{
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unget_char(ch, file);
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}
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}
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/* unget_char(ch, file) : like ungetc but do LineNumber processing
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*/
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void unget_char(int ch, FILE *file)
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{
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ungetc(ch, file);
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if (ch == '\n')
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{
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Set_LineNum(LineNumber - 1);
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}
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}
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/* this function reads one file entry -- the next -- from a file.
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* it skips any leading blank lines, ignores comments, and returns
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* NULL if for any reason the entry can't be read and parsed.
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*/
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char *load_entry(FILE *file)
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{
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int ch;
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static char cmd[MAX_COMMAND];
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skip_comments(file);
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ch = get_string(cmd, MAX_COMMAND, file, "\n");
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if (ch == EOF)
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{
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return NULL;
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}
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return cmd;
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}
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EnviromentPair *ParseLine(char *line)
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{
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char *tmpPtr;
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static EnviromentPair *Env;
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unsigned short length = strlen(line);
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Env->key = "";
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Env->value = "";
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for (tmpPtr = line; *tmpPtr; tmpPtr++)
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{
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if (*tmpPtr == '=')
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{
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*tmpPtr = 0;
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Env->key = line;
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if (strlen(Env->key) < length)
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{
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Env->value = ++tmpPtr;
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}
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return Env;
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}
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}
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return Env;
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}
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char *getenv(const char *name)
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{
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FILE *fp;
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char *LineStr = NULL;
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EnviromentPair *Env1;
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FSSpec spec;
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OSErr err;
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if (IgnoreEnvironment)
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return NULL; /* user wants to ignore the environment vars */
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if (name == NULL)
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return NULL;
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GetCompletePath(CompletePath,"MacZip.Env",&spec,&err);
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/* try open the file in the current folder */
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fp = FSp_fopen(&spec,"r");
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if (fp == NULL)
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{ /* Okey, lets try open the file in the preference folder */
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FSpFindFolder_Name(
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kOnSystemDisk,
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kPreferencesFolderType,
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kDontCreateFolder,
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&spec,
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"\pMacZip.Env");
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fp = FSp_fopen(&spec,"r");
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if (fp == NULL)
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{
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return NULL; /* there is no enviroment-file */
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}
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}
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LineStr = load_entry(fp);
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while (LineStr != NULL)
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{ /* parse the file line by line */
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Env1 = ParseLine(LineStr);
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if (strlen(Env1->value) > 0)
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{ /* we found a key/value pair */
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if (ListAllKeyValues)
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printf("\n Line:%3d [%s] = [%s]",LineNumber,Env1->key,Env1->value);
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if (stricmp(name,Env1->key) == 0)
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{ /* we found the value of a given key */
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return Env1->value;
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}
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}
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LineStr = load_entry(fp); /* read next line */
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}
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fclose(fp);
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return NULL;
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}
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OSErr FSpFindFolder_Name(
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short vRefNum, /* Volume reference number. */
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OSType folderType, /* Folder type taken by FindFolder. */
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Boolean createFolder, /* Should we create it if non-existant. */
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FSSpec *spec, /* Pointer to resulting directory. */
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unsigned char *name) /* Name of the file in the folder */
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{
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short foundVRefNum;
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long foundDirID;
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OSErr err;
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err = FindFolder(vRefNum, folderType, createFolder,
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&foundVRefNum, &foundDirID);
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if (err != noErr)
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{
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return err;
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}
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err = FSMakeFSSpec(foundVRefNum, foundDirID, name, spec);
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return err;
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}
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void ShowAllKeyValues(void)
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{
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OSErr err;
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FSSpec spec;
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Boolean tmpIgnoreEnvironment = IgnoreEnvironment;
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ListAllKeyValues = 1;
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IgnoreEnvironment = false;
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GetCompletePath(CompletePath,"MacZip.Env",&spec,&err);
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if (err != 0)
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{ /* Okey, lets try open the file in the preference folder */
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FSpFindFolder_Name(
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kOnSystemDisk,
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kPreferencesFolderType,
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kDontCreateFolder,
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&spec,
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"\pMacZip.Env");
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GetFullPathFromSpec(CompletePath,&spec, &err);
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if (err != 0)
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{
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return; /* there is no enviroment-file */
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}
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}
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printf("\nLocation of the current \"MacZip.Env\" file:\n [%s]",CompletePath);
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printf("\n\nList of all environment variables\n");
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getenv(" ");
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printf("\n\nEnd\n\n");
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/* restore used variables */
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ListAllKeyValues = 0;
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LineNumber = 0;
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IgnoreEnvironment = tmpIgnoreEnvironment;
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}
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