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capela |
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// common.c |
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capela |
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// |
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/**************************************************************************** |
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liblscp - LinuxSampler Control Protocol API |
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Copyright (C) 2004, rncbc aka Rui Nuno Capela. All rights reserved. |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*****************************************************************************/ |
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#include "common.h" |
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#include <ctype.h> |
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// Chunk size magic: |
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// LSCP_SPLIT_CHUNK1 = 2 ^ LSCP_SPLIT_CHUNK2 |
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#define LSCP_SPLIT_CHUNK1 4 |
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#define LSCP_SPLIT_CHUNK2 2 |
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// Chunk size legal calculator. |
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#define LSCP_SPLIT_SIZE(n) ((((n) >> LSCP_SPLIT_CHUNK2) + 1) << LSCP_SPLIT_CHUNK2) |
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//------------------------------------------------------------------------- |
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capela |
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// Local client request executive. |
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capela |
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|
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capela |
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// Result buffer internal settler. |
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void lscp_client_set_result ( lscp_client_t *pClient, char *pszResult, int iErrno ) |
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{ |
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if (pClient->pszResult) |
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free(pClient->pszResult); |
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pClient->pszResult = NULL; |
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pClient->iErrno = iErrno; |
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if (pszResult) |
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pClient->pszResult = strdup(lscp_ltrim(pszResult)); |
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} |
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// The main client requester call executive. |
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lscp_status_t lscp_client_call ( lscp_client_t *pClient, const char *pszQuery ) |
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{ |
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fd_set fds; // File descriptor list for select(). |
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int fd, fdmax; // Maximum file descriptor number. |
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struct timeval tv; // For specifying a timeout value. |
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int iSelect; // Holds select return status. |
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int iTimeout; |
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int cchQuery; |
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char achResult[LSCP_BUFSIZ]; |
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int cchResult; |
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const char *pszSeps = ":[]"; |
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char *pszResult; |
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char *pszToken; |
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char *pch; |
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int iErrno; |
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lscp_status_t ret = LSCP_FAILED; |
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if (pClient == NULL) |
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return ret; |
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pszResult = NULL; |
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iErrno = -1; |
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// Check if command socket socket is still valid. |
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if (pClient->cmd.sock == INVALID_SOCKET) { |
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pszResult = "Connection closed or no longer valid"; |
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lscp_client_set_result(pClient, pszResult, iErrno); |
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return ret; |
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} |
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// Send data, and then, wait for the result... |
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cchQuery = strlen(pszQuery); |
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if (send(pClient->cmd.sock, pszQuery, cchQuery, 0) < cchQuery) { |
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lscp_socket_perror("_lscp_client_call: send"); |
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pszResult = "Failure during send operation"; |
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lscp_client_set_result(pClient, pszResult, iErrno); |
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return ret; |
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} |
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// Prepare for waiting on select... |
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fd = (int) pClient->cmd.sock; |
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FD_ZERO(&fds); |
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FD_SET((unsigned int) fd, &fds); |
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fdmax = fd; |
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// Use the timeout select feature... |
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iTimeout = pClient->iTimeout; |
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if (iTimeout > 1000) { |
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tv.tv_sec = iTimeout / 1000; |
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iTimeout -= tv.tv_sec * 1000; |
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} |
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else tv.tv_sec = 0; |
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tv.tv_usec = iTimeout * 1000; |
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// Wait for event... |
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iSelect = select(fdmax + 1, &fds, NULL, NULL, &tv); |
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if (iSelect > 0 && FD_ISSET(fd, &fds)) { |
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// May recv now... |
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cchResult = recv(pClient->cmd.sock, achResult, sizeof(achResult), 0); |
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if (cchResult > 0) { |
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// Assume early success. |
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ret = LSCP_OK; |
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// Always force the result to be null terminated (and trim trailing CRLFs)! |
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while (cchResult > 0 && (achResult[cchResult - 1] == '\n' || achResult[cchResult- 1] == '\r')) |
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cchResult--; |
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achResult[cchResult] = (char) 0; |
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// Check if the response it's an error or warning message. |
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if (strncasecmp(achResult, "WRN:", 4) == 0) |
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ret = LSCP_WARNING; |
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else if (strncasecmp(achResult, "ERR:", 4) == 0) |
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ret = LSCP_ERROR; |
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// So we got a result... |
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if (ret == LSCP_OK) { |
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// Reset errno in case of success. |
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iErrno = 0; |
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// Is it a special successful response? |
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if (strncasecmp(achResult, "OK[", 3) == 0) { |
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// Parse the OK message, get the return string under brackets... |
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pszToken = lscp_strtok(achResult, pszSeps, &(pch)); |
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if (pszToken) |
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pszResult = lscp_strtok(NULL, pszSeps, &(pch)); |
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} |
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else pszResult = achResult; |
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// The result string is now set to the command response, if any. |
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} else { |
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// Parse the error/warning message, skip first colon... |
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pszToken = lscp_strtok(achResult, pszSeps, &(pch)); |
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if (pszToken) { |
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// Get the error number... |
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pszToken = lscp_strtok(NULL, pszSeps, &(pch)); |
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if (pszToken) { |
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iErrno = atoi(pszToken); |
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// And make the message text our final result. |
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pszResult = lscp_strtok(NULL, pszSeps, &(pch)); |
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} |
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} |
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// The result string is set to the error/warning message text. |
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} |
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} |
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else if (cchResult == 0) { |
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// Damn, server disconnected, we better free everything down here. |
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lscp_socket_agent_free(&(pClient->evt)); |
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lscp_socket_agent_free(&(pClient->cmd)); |
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// Fake a result message. |
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ret = LSCP_QUIT; |
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pszResult = "Server terminated the connection"; |
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iErrno = (int) ret; |
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} else { |
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// What's down? |
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lscp_socket_perror("_lscp_client_call: recv"); |
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pszResult = "Failure during receive operation"; |
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} |
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} // Check if select has timed out. |
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else if (iSelect == 0) { |
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// Fake a result message. |
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ret = LSCP_TIMEOUT; |
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pszResult = "Timeout during receive operation"; |
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iErrno = (int) ret; |
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} |
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else lscp_socket_perror("_lscp_client_call: select"); |
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// Make the result official... |
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lscp_client_set_result(pClient, pszResult, iErrno); |
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return ret; |
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} |
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//------------------------------------------------------------------------- |
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// Other general utility functions. |
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capela |
103 |
// Trimming left spaces... |
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char *lscp_ltrim ( char *psz ) |
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{ |
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while (isspace(*psz)) |
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psz++; |
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return psz; |
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} |
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// Unquote an in-split string. |
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char *lscp_unquote ( char **ppsz, int dup ) |
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{ |
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char chQuote; |
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char *psz = *ppsz; |
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while (isspace(*psz)) |
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++psz; |
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if (*psz == '\"' || *psz == '\'') { |
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chQuote = *psz++; |
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while (isspace(*psz)) |
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++psz; |
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if (dup) |
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psz = strdup(psz); |
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*ppsz = psz; |
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if (*ppsz) { |
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while (**ppsz && **ppsz != chQuote) |
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++(*ppsz); |
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if (**ppsz) { |
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while (isspace(*(*ppsz - 1)) && *ppsz > psz) |
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--(*ppsz); |
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*(*ppsz)++ = (char) 0; |
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} |
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} |
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} |
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else if (dup) { |
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psz = strdup(psz); |
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*ppsz = psz; |
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} |
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return psz; |
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} |
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// Custom tokenizer. |
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char *lscp_strtok ( char *pchBuffer, const char *pszSeps, char **ppch ) |
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{ |
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char *pszToken; |
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if (pchBuffer == NULL) |
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pchBuffer = *ppch; |
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pchBuffer += strspn(pchBuffer, pszSeps); |
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if (*pchBuffer == '\0') |
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return NULL; |
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pszToken = pchBuffer; |
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pchBuffer = strpbrk(pszToken, pszSeps); |
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if (pchBuffer == NULL) { |
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*ppch = strchr(pszToken, '\0'); |
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} else { |
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*pchBuffer = '\0'; |
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*ppch = pchBuffer + 1; |
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while (**ppch && strchr(pszSeps, **ppch)) |
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(*ppch)++; |
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} |
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return pszToken; |
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} |
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// Split a comma separated string into a null terminated array of strings. |
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char **lscp_szsplit_create ( const char *pszCsv, const char *pszSeps ) |
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{ |
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char *pszHead, *pch; |
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int iSize, i, j, cchSeps; |
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char **ppszSplit, **ppszNewSplit; |
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// Initial size is one chunk away. |
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iSize = LSCP_SPLIT_CHUNK1; |
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// Allocate and split... |
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ppszSplit = (char **) malloc(iSize * sizeof(char *)); |
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if (ppszSplit == NULL) |
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return NULL; |
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// Make a copy of the original string. |
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i = 0; |
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pszHead = (char *) pszCsv; |
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if ((ppszSplit[i++] = lscp_unquote(&pszHead, 1)) == NULL) { |
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free(ppszSplit); |
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return NULL; |
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} |
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// Go on for it... |
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cchSeps = strlen(pszSeps); |
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while ((pch = strpbrk(pszHead, pszSeps)) != NULL) { |
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// Pre-advance to next item. |
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pszHead = pch + cchSeps; |
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// Trim and null terminate current item. |
282 |
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while (isspace(*(pch - 1)) && pch > ppszSplit[0]) |
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--pch; |
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*pch = (char) 0; |
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// Make it official. |
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ppszSplit[i++] = lscp_unquote(&pszHead, 0); |
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// Do we need to grow? |
288 |
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if (i >= iSize) { |
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// Yes, but only grow in chunks. |
290 |
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iSize += LSCP_SPLIT_CHUNK1; |
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// Allocate and copy to new split array. |
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ppszNewSplit = (char **) malloc(iSize * sizeof(char *)); |
293 |
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if (ppszNewSplit) { |
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for (j = 0; j < i; j++) |
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ppszNewSplit[j] = ppszSplit[j]; |
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free(ppszSplit); |
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ppszSplit = ppszNewSplit; |
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} |
299 |
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} |
300 |
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} |
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// NULL terminate split array. |
303 |
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for ( ; i < iSize; i++) |
304 |
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ppszSplit[i] = NULL; |
305 |
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306 |
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return ppszSplit; |
307 |
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} |
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310 |
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// Free allocated memory of a legal null terminated array of strings. |
311 |
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void lscp_szsplit_destroy ( char **ppszSplit ) |
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{ |
313 |
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// Our split string is always the first item, if any. |
314 |
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if (ppszSplit && ppszSplit[0]) |
315 |
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free(ppszSplit[0]); |
316 |
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// Now free the array itself. |
317 |
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if (ppszSplit) |
318 |
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free(ppszSplit); |
319 |
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} |
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#ifdef LSCP_SZSPLIT_COUNT |
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324 |
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// Return the number of items of a null terminated array of strings. |
325 |
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int lscp_szsplit_count ( char **ppszSplit ) |
326 |
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{ |
327 |
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int i = 0; |
328 |
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while (ppszSplit && ppszSplit[i]) |
329 |
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i++; |
330 |
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return i; |
331 |
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} |
332 |
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333 |
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// Return the allocated number of items of a splitted string array. |
334 |
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int lscp_szsplit_size ( char **ppszSplit ) |
335 |
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{ |
336 |
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return LSCP_SPLIT_SIZE(lscp_szsplit_count(ppszSplit)); |
337 |
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} |
338 |
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#endif // LSCP_SZSPLIT_COUNT |
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341 |
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342 |
capela |
125 |
// Split a comma separated string into a -1 terminated array of positive integers. |
343 |
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int *lscp_isplit_create ( const char *pszCsv, const char *pszSeps ) |
344 |
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{ |
345 |
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char *pchHead, *pch; |
346 |
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int iSize, i, j, cchSeps; |
347 |
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int *piSplit, *piNewSplit; |
348 |
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349 |
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// Initial size is one chunk away. |
350 |
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iSize = LSCP_SPLIT_CHUNK1; |
351 |
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// Allocate and split... |
352 |
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piSplit = (int *) malloc(iSize * sizeof(int)); |
353 |
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if (piSplit == NULL) |
354 |
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return NULL; |
355 |
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356 |
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// Make a copy of the original string. |
357 |
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i = 0; |
358 |
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pchHead = (char *) pszCsv; |
359 |
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if ((piSplit[i++] = atoi(pchHead)) < 0) { |
360 |
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free(piSplit); |
361 |
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return NULL; |
362 |
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} |
363 |
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364 |
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// Go on for it... |
365 |
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cchSeps = strlen(pszSeps); |
366 |
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while ((pch = strpbrk(pchHead, pszSeps)) != NULL) { |
367 |
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// Pre-advance to next item. |
368 |
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pchHead = pch + cchSeps; |
369 |
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// Make it official. |
370 |
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piSplit[i++] = atoi(pchHead); |
371 |
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// Do we need to grow? |
372 |
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if (i >= iSize) { |
373 |
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// Yes, but only grow in chunks. |
374 |
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iSize += LSCP_SPLIT_CHUNK1; |
375 |
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// Allocate and copy to new split array. |
376 |
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piNewSplit = (int *) malloc(iSize * sizeof(int)); |
377 |
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if (piNewSplit) { |
378 |
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for (j = 0; j < i; j++) |
379 |
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piNewSplit[j] = piSplit[j]; |
380 |
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free(piSplit); |
381 |
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piSplit = piNewSplit; |
382 |
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} |
383 |
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} |
384 |
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|
} |
385 |
|
|
|
386 |
|
|
// NULL terminate split array. |
387 |
|
|
for ( ; i < iSize; i++) |
388 |
|
|
piSplit[i] = -1; |
389 |
|
|
|
390 |
|
|
return piSplit; |
391 |
|
|
} |
392 |
|
|
|
393 |
|
|
|
394 |
|
|
// Destroy a integer splitted array. |
395 |
|
|
void lscp_isplit_destroy ( int *piSplit ) |
396 |
|
|
{ |
397 |
|
|
if (piSplit) |
398 |
|
|
free(piSplit); |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
|
402 |
|
|
#ifdef LSCP_ISPLIT_COUNT |
403 |
|
|
|
404 |
|
|
// Compute a string list valid item count. |
405 |
|
|
int lscp_isplit_count ( int *piSplit ) |
406 |
|
|
{ |
407 |
|
|
int i = 0; |
408 |
|
|
while (piSplit && piSplit[i] >= 0) |
409 |
|
|
i++; |
410 |
|
|
return i; |
411 |
|
|
} |
412 |
|
|
|
413 |
|
|
// Compute a string list size. |
414 |
|
|
int lscp_isplit_size ( int *piSplit ) |
415 |
|
|
{ |
416 |
|
|
return LSCP_SPLIT_SIZE(lscp_isplit_count(piSplit)); |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
#endif // LSCP_ISPLIT_COUNT |
420 |
|
|
|
421 |
|
|
|
422 |
capela |
103 |
//------------------------------------------------------------------------- |
423 |
|
|
// Engine info struct helper functions. |
424 |
|
|
|
425 |
|
|
void lscp_engine_info_init ( lscp_engine_info_t *pEngineInfo ) |
426 |
|
|
{ |
427 |
|
|
pEngineInfo->description = NULL; |
428 |
|
|
pEngineInfo->version = NULL; |
429 |
|
|
} |
430 |
|
|
|
431 |
|
|
void lscp_engine_info_reset ( lscp_engine_info_t *pEngineInfo ) |
432 |
|
|
{ |
433 |
|
|
if (pEngineInfo->description) |
434 |
|
|
free(pEngineInfo->description); |
435 |
|
|
if (pEngineInfo->version) |
436 |
|
|
free(pEngineInfo->version); |
437 |
|
|
|
438 |
|
|
lscp_engine_info_init(pEngineInfo); |
439 |
|
|
} |
440 |
|
|
|
441 |
|
|
|
442 |
|
|
//------------------------------------------------------------------------- |
443 |
|
|
// Channel info struct helper functions. |
444 |
|
|
|
445 |
|
|
void lscp_channel_info_init ( lscp_channel_info_t *pChannelInfo ) |
446 |
|
|
{ |
447 |
capela |
132 |
pChannelInfo->engine_name = NULL; |
448 |
|
|
pChannelInfo->audio_device = 0; |
449 |
|
|
pChannelInfo->audio_channels = 0; |
450 |
|
|
pChannelInfo->audio_routing = NULL; |
451 |
|
|
pChannelInfo->instrument_file = NULL; |
452 |
|
|
pChannelInfo->instrument_nr = 0; |
453 |
|
|
pChannelInfo->instrument_status = 0; |
454 |
|
|
pChannelInfo->midi_device = 0; |
455 |
|
|
pChannelInfo->midi_port = 0; |
456 |
|
|
pChannelInfo->midi_channel = 0; |
457 |
|
|
pChannelInfo->volume = 0.0; |
458 |
capela |
103 |
} |
459 |
|
|
|
460 |
|
|
void lscp_channel_info_reset ( lscp_channel_info_t *pChannelInfo ) |
461 |
|
|
{ |
462 |
|
|
if (pChannelInfo->engine_name) |
463 |
|
|
free(pChannelInfo->engine_name); |
464 |
|
|
if (pChannelInfo->audio_routing) |
465 |
|
|
lscp_szsplit_destroy(pChannelInfo->audio_routing); |
466 |
|
|
if (pChannelInfo->instrument_file) |
467 |
|
|
free(pChannelInfo->instrument_file); |
468 |
|
|
|
469 |
|
|
lscp_channel_info_init(pChannelInfo); |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
|
473 |
|
|
//------------------------------------------------------------------------- |
474 |
|
|
// Driver info struct functions. |
475 |
|
|
|
476 |
|
|
void lscp_driver_info_init ( lscp_driver_info_t *pDriverInfo ) |
477 |
|
|
{ |
478 |
|
|
pDriverInfo->description = NULL; |
479 |
|
|
pDriverInfo->version = NULL; |
480 |
|
|
pDriverInfo->parameters = NULL; |
481 |
|
|
} |
482 |
|
|
|
483 |
|
|
void lscp_driver_info_reset ( lscp_driver_info_t *pDriverInfo ) |
484 |
|
|
{ |
485 |
|
|
if (pDriverInfo->description) |
486 |
|
|
free(pDriverInfo->description); |
487 |
|
|
if (pDriverInfo->version) |
488 |
|
|
free(pDriverInfo->version); |
489 |
|
|
lscp_szsplit_destroy(pDriverInfo->parameters); |
490 |
|
|
|
491 |
|
|
lscp_driver_info_init(pDriverInfo); |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
|
495 |
|
|
// end of common.c |