| 1 | /* $Id: env.c,v 1.3 2000-09-02 21:08:13 bird Exp $
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| 2 | *
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| 3 | * Environment access functions
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| 4 | *
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| 5 | * Copyright (c) 2000 knut st. osmundsen (knut.stange.osmundsen@pmsc.no)
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| 6 | *
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| 7 | * Project Odin Software License can be found in LICENSE.TXT
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | /*******************************************************************************
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| 12 | * Defined Constants And Macros *
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| 13 | *******************************************************************************/
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| 14 | #define INCL_DOSERRORS /* Error codes */
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| 15 | #define INCL_OS2KRNL_VM /* OS2KRNL: Virtual Memory Management */
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| 16 | #define INCL_OS2KRNL_PTDA /* OS2KNRL: (per)ProcessTaskDataArea */
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| 17 |
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| 18 | /*******************************************************************************
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| 19 | * Header Files *
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| 20 | *******************************************************************************/
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| 21 | #include <os2.h>
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| 22 |
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| 23 | #include "devSegDf.h" /* Win32k segment definitions. */
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| 24 | #include "dev32.h"
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| 25 | #include "dev32hlp.h"
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| 26 | #include "log.h"
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| 27 | #include "OS2Krnl.h"
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| 28 | #include <string.h>
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| 29 | #include "macros.h"
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| 30 | #include "env.h"
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Scans the given environment data for a given environment variable and returns
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| 35 | * its value if found.
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| 36 | * @returns Pointer to environment variable value for the variable given in
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| 37 | * pszVar.
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| 38 | * If the variable wasn't found NULL is returned.
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| 39 | * @param paszEnv Pointer to the environment data to search.
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| 40 | * The environment data is a list of zero-strings terminated
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| 41 | * by an empty string. The strings consists of two parts which
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| 42 | * are separated by a euqal char ('='). The first part is the
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| 43 | * variable name. The second part is the value of the variable.
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| 44 | *
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| 45 | * IF this is NULL we'll simply return NULL.
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| 46 | * @param pszVar Name of the environment variable to find. (NULL not allowed.)
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| 47 | */
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| 48 | const char *ScanEnv(const char *paszEnv, const char *pszVar)
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| 49 | {
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| 50 | int cchVar;
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| 51 | /*
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| 52 | * Return if environment not found.
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| 53 | */
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| 54 | #ifdef DEBUG
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| 55 | if (pszVar < (const char *)0x10000 || *pszVar == '\0')
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| 56 | kprintf(("ScanEnv: Invalid parameter pszVar (%p)\n", pszVar));
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| 57 | #endif
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| 58 | if (paszEnv == NULL)
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| 59 | return NULL;
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| 60 | #ifdef DEBUG
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| 61 | if (paszEnv < (const char *)0x10000)
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| 62 | kprintf(("ScanEnv: Invalid parameter paszEnv (%p)\n", paszEnv));
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| 63 | #endif
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| 64 |
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| 65 | /*
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| 66 | * Loop thru the environment data until an empty string is reached.
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| 67 | */
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| 68 | cchVar = strlen(pszVar);
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| 69 | while (*paszEnv != '\0')
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| 70 | {
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| 71 | /*
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| 72 | * Check if the variable name is it's matching the one we're searching for.
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| 73 | */
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| 74 | const char *pszEqual = strchr(paszEnv, '=');
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| 75 | if (pszEqual != NULL && (pszEqual - paszEnv) == cchVar
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| 76 | && memcmp(paszEnv, pszVar, cchVar) == 0
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| 77 | )
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| 78 | {
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| 79 | /*
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| 80 | * Variable was found. Return pointer to the value.
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| 81 | */
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| 82 | return pszEqual + 1;
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| 83 | }
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| 84 |
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| 85 | /*
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| 86 | * Skip this variable. (Don't use pszEqual since it might be NULL)
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| 87 | */
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| 88 | paszEnv += strlen(paszEnv) + 1;
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| 89 | }
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| 90 |
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| 91 | return NULL;
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| 92 | }
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| 93 |
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| 94 |
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| 95 | /**
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| 96 | * Get the linear pointer to the environment data for the current
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| 97 | * process or the process being started (EXECed).
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| 98 | *
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| 99 | * @param fExecChild TRUE: Get exec child environment.
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| 100 | * (Not supported by method 2)
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| 101 | * FALSE: Get current process environment.
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| 102 | * @returns Pointer to environment data.
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| 103 | * NULL on failure.
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| 104 | */
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| 105 | const char *GetEnv(BOOL fExecChild)
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| 106 | {
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| 107 | /* There are probably two ways of getting the environment data for the
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| 108 | * current process: 1) get it from the PTDA->ptda_environ
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| 109 | * 2) Local infosegment (LIS from GetDosVar devhlp)
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| 110 | * I am not sure which one of these which works best. What I know is that
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| 111 | * method 1) is used by the w_GetEnv API worker. This API is called at
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| 112 | * Ring-0 from some delete file operation. (Which uses it to get the
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| 113 | * DELETEDIR environment variable.) The w_GetEnv API worker is 16-bit
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| 114 | * I don't want to thunk around using that. There for I'll implement
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| 115 | * my own GetEnv. So, currently I'll write the code for both 1) and
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| 116 | * 2), testing will show which one of them are the better.
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| 117 | */
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| 118 |
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| 119 | #if 1
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| 120 | PPTDA pPTDACur; /* Pointer to the current (system context) PTDA */
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| 121 | PPTDA pPTDA; /* PTDA in question. */
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| 122 | USHORT hobEnviron; /* Object handle of the environ block */
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| 123 | APIRET rc; /* Return from VMObjHandleInfo. */
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| 124 | USHORT ushPTDA; /* Handle of the context PTDA. (VMObjH..) */
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| 125 | ULONG ulAddr = 0; /* Address of the environment data. */
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| 126 |
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| 127 | /*
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| 128 | * Use PTDA (1):
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| 129 | * Get the current PTDA. (Fail if this call failes.)
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| 130 | * IF pPTDAExecChild isn't NULL THEN try get environment for that first.
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| 131 | * IF failed or no pPTDAExecChild THEN try get environment from pPTDA.
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| 132 | */
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| 133 | pPTDACur = ptdaGetCur();
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| 134 | if (pPTDACur != NULL)
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| 135 | {
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| 136 | pPTDA = ptdaGet_pPTDAExecChild(pPTDACur);
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| 137 | if (pPTDA != NULL && fExecChild)
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| 138 | {
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| 139 | hobEnviron = ptdaGet_ptda_environ(pPTDA);
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| 140 | if (hobEnviron != 0)
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| 141 | {
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| 142 | rc = VMObjHandleInfo(hobEnviron, SSToDS(&ulAddr), SSToDS(&ushPTDA));
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| 143 | if (rc == NO_ERROR)
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| 144 | return (const char *)ulAddr;
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| 145 | kprintf(("GetEnv: (1) VMObjHandleInfo failed with rc=%d for hob=0x%04x \n", rc, hobEnviron));
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | hobEnviron = ptdaGet_ptda_environ(pPTDACur);
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| 150 | if (hobEnviron != 0)
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| 151 | {
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| 152 | rc = VMObjHandleInfo(hobEnviron, SSToDS(&ulAddr), SSToDS(&ushPTDA));
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| 153 | if (rc == NO_ERROR)
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| 154 | return (const char *)ulAddr;
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| 155 | kprintf(("GetEnv: (2) VMObjHandleInfo failed with rc=%d for hob=0x%04x\n", rc, hobEnviron));
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| 156 | }
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| 157 | }
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| 158 | else
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| 159 | { /* Not called at task time? No current task! */
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| 160 | kprintf(("GetEnv: Failed to get current PTDA.\n"));
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| 161 | }
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| 162 |
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| 163 | return NULL;
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| 164 |
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| 165 |
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| 166 | #else
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| 167 |
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| 168 |
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| 169 | struct InfoSegLDT * pLIS; /* Pointer to local infosegment. */
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| 170 | PVOID pv; /* Address to return. */
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| 171 |
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| 172 |
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| 173 | /*
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| 174 | * Use LocalInfoSegment (2)
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| 175 | * Get the LIS using Dh32_GetDosVar
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| 176 | */
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| 177 | pLIS = (struct InfoSegLDT*)D32Hlp_GetDOSVar(DHGETDOSV_LOCINFOSEG, 0);
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| 178 | if (pLIS == NULL)
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| 179 | {
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| 180 | kprintf(("GetEnv: Failed to get local info segment\n"));
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| 181 | NOREF(fExecChild);
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| 182 | return NULL;
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| 183 | }
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| 184 |
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| 185 | if (pLIS->LIS_AX <= 3)
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| 186 | {
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| 187 | kprintf(("GetEnv: environment selector is %d, ie. NULL\n", pLIS->LIS_AX));
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| 188 | return NULL;
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| 189 | }
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| 190 |
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| 191 | pv = D32Hlp_VirtToLin2(pLIS->LIS_AX, 0);
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| 192 | if (pv != NULL)
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| 193 | {
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| 194 | kprintf(("GetEnv: VirtToLin2 failed to thunk %04x:0000 to linar address\n", pLIS->LIS_AX));
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| 195 | }
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| 196 | return (const char *)pv;
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| 197 | #endif
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| 198 | }
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