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boinc/lib/str_util.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
#if defined(_WIN32) && !defined(__STDWX_H__)
#include "boinc_win.h"
#elif defined(_WIN32) && defined(__STDWX_H__)
#include "stdwx.h"
#endif
#ifdef _WIN32
#include "win_util.h"
#endif
#ifndef _WIN32
#include "config.h"
#include <string>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_ALLOCA_H
#include "alloca.h"
#endif
#endif
#include "error_numbers.h"
#include "common_defs.h"
#include "filesys.h"
#include "str_replace.h"
#include "str_util.h"
#ifdef _USING_FCGI_
#include "boinc_fcgi.h"
#endif
using std::string;
// Use this instead of strncpy().
// Result will always be null-terminated, and it's faster.
// see http://www.gratisoft.us/todd/papers/strlcpy.html
//
#if !defined(HAVE_STRLCPY)
size_t strlcpy(char *dst, const char *src, size_t size) {
size_t ret = strlen(src);
if (size) {
size_t len = (ret >= size) ? size-1 : ret;
memcpy(dst, src, len);
dst[len] = '\0';
}
return ret;
}
#endif
#if !defined(HAVE_STRLCAT)
size_t strlcat(char *dst, const char *src, size_t size) {
size_t dst_len = strlen(dst);
size_t src_len = strlen(src);
if (size) {
size_t len = (src_len >= size-dst_len) ? (size-dst_len-1) : src_len;
memcpy(&dst[dst_len], src, len);
dst[dst_len + len] = '\0';
}
return dst_len + src_len;
}
#endif // !HAVE_STRLCAT
#if !defined(HAVE_STRCASESTR)
const char *strcasestr(const char *s1, const char *s2) {
char *needle=NULL, *haystack=NULL, *p=NULL;
bool need_free = false;
// Is alloca() really less likely to fail with out of memory error
// than strdup?
#if defined(HAVE_STRDUPA)
haystack=strdupa(s1);
needle=strdupa(s2);
#elif defined(HAVE_ALLOCA_H) || defined(HAVE_ALLOCA)
haystack=(char *)alloca(strlen(s1)+1);
needle=(char *)alloca(strlen(s2)+1);
if (needle && haystack) {
strlcpy(haystack,s1,strlen(s1)+1);
strlcpy(needle,s2,strlen(s2)+1);
}
#elif defined(HAVE_STRDUP)
haystack=strdup(s1);
needle=strdup(s1)
need_free = true;
#else
haystack=(char *)malloc(strlen(s1)+1);
needle=(char *)malloc(strlen(s2)+1);
if (needle && haystack) {
strlcpy(haystack,s1,strlen(s1)+1);
strlcpy(needle,s2,strlen(s2)+1);
}
need_free = true;
#endif
if (needle && haystack) {
// convert both strings to lower case
p = haystack;
while (*p) {
*p = tolower(*p);
p++;
}
p = needle;
while (*p) {
*p = tolower(*p);
p++;
}
// find the substring
p = strstr(haystack, needle);
// correct the pointer to point to the substring within s1
if (p) {
p = const_cast<char *>(s1)+(p-haystack);
}
}
if (need_free) {
if (needle) free(needle);
if (haystack) free(haystack);
}
return p;
}
#endif
// Converts a double precision time (where the value of 1 represents
// a day) into a string. smallest_timescale determines the smallest
// unit of time division used
// smallest_timescale: 0=seconds, 1=minutes, 2=hours, 3=days, 4=years
//
int ndays_to_string (double x, int smallest_timescale, char *buf) {
double years, days, hours, minutes, seconds;
char year_buf[64], day_buf[16], hour_buf[16], min_buf[16], sec_buf[16];
if (x < 0 || buf == NULL) return ERR_NULL;
years = x / 365.25;
days = fmod(x, 365.25);
hours = fmod(x*24, 24);
minutes = fmod(x*24*60, 60);
seconds = fmod(x*24*60*60, 60);
if (smallest_timescale==4) {
sprintf( year_buf, "%.3f yr ", years );
} else if (years > 1 && smallest_timescale < 4) {
sprintf( year_buf, "%d yr ", (int)years );
} else {
strcpy( year_buf, "" );
}
if (smallest_timescale==3) {
sprintf( day_buf, "%.2f day%s ", days, (days>1?"s":"") );
} else if (days > 1 && smallest_timescale < 3) {
sprintf( day_buf, "%d day%s ", (int)days, (days>1?"s":"") );
} else {
strcpy( day_buf, "" );
}
if (smallest_timescale==2) {
sprintf( hour_buf, "%.2f hr ", hours );
} else if (hours > 1 && smallest_timescale < 2) {
sprintf( hour_buf, "%d hr ", (int)hours );
} else {
strcpy( hour_buf, "" );
}
if (smallest_timescale==1) {
sprintf( min_buf, "%.2f min ", minutes );
} else if (minutes > 1 && smallest_timescale < 1) {
sprintf( min_buf, "%d min ", (int)minutes );
} else {
strcpy( min_buf, "" );
}
if (smallest_timescale==0) {
sprintf( sec_buf, "%.2f sec ", seconds );
} else if (seconds > 1 && smallest_timescale < 0) {
sprintf( sec_buf, "%d sec ", (int)seconds );
} else {
strcpy( sec_buf, "" );
}
// the "-0.05" below is to prevent it from printing 60.0 sec
// when the real value is e.g. 59.91
//
sprintf(buf, "%s%s%s%s%s", year_buf, day_buf, hour_buf, min_buf, sec_buf);
return 0;
}
// Convert nbytes into a string. If total_bytes is non-zero,
// convert the two into a fractional display (i.e. 4/16 KB)
//
void nbytes_to_string(double nbytes, double total_bytes, char* str, int len) {
char buf[256];
double xTera = (1024.0*1024.0*1024.0*1024.0);
double xGiga = (1024.0*1024.0*1024.0);
double xMega = (1024.0*1024.0);
double xKilo = (1024.0);
if (total_bytes != 0) {
if (total_bytes >= xTera) {
sprintf(buf, "%0.2f/%0.2f TB", nbytes/xTera, total_bytes/xTera);
} else if (total_bytes >= xGiga) {
sprintf(buf, "%0.2f/%0.2f GB", nbytes/xGiga, total_bytes/xGiga);
} else if (total_bytes >= xMega) {
sprintf(buf, "%0.2f/%0.2f MB", nbytes/xMega, total_bytes/xMega);
} else if (total_bytes >= xKilo) {
sprintf(buf, "%0.2f/%0.2f KB", nbytes/xKilo, total_bytes/xKilo);
} else {
sprintf(buf, "%0.0f/%0.0f bytes", nbytes, total_bytes);
}
} else {
if (nbytes >= xTera) {
sprintf(buf, "%0.2f TB", nbytes/xTera);
} else if (nbytes >= xGiga) {
sprintf(buf, "%0.2f GB", nbytes/xGiga);
} else if (nbytes >= xMega) {
sprintf(buf, "%0.2f MB", nbytes/xMega);
} else if (nbytes >= xKilo) {
sprintf(buf, "%0.2f KB", nbytes/xKilo);
} else {
sprintf(buf, "%0.0f bytes", nbytes);
}
}
strlcpy(str, buf, len);
}
// take a string containing some space separated words.
// return an array of pointers to the null-terminated words.
// Modifies the string arg.
// Returns argc
// TODO: use strtok here
#define NOT_IN_TOKEN 0
#define IN_SINGLE_QUOTED_TOKEN 1
#define IN_DOUBLE_QUOTED_TOKEN 2
#define IN_UNQUOTED_TOKEN 3
int parse_command_line(char* p, char** argv) {
int state = NOT_IN_TOKEN;
int argc=0;
while (*p) {
switch(state) {
case NOT_IN_TOKEN:
if (isspace(*p)) {
} else if (*p == '\'') {
p++;
argv[argc++] = p;
state = IN_SINGLE_QUOTED_TOKEN;
break;
} else if (*p == '\"') {
p++;
argv[argc++] = p;
state = IN_DOUBLE_QUOTED_TOKEN;
break;
} else {
argv[argc++] = p;
state = IN_UNQUOTED_TOKEN;
}
break;
case IN_SINGLE_QUOTED_TOKEN:
if (*p == '\'') {
*p = 0;
state = NOT_IN_TOKEN;
}
break;
case IN_DOUBLE_QUOTED_TOKEN:
if (*p == '\"') {
*p = 0;
state = NOT_IN_TOKEN;
}
break;
case IN_UNQUOTED_TOKEN:
if (isspace(*p)) {
*p = 0;
state = NOT_IN_TOKEN;
}
break;
}
p++;
}
argv[argc] = 0;
return argc;
}
// remove whitespace from start and end of a string
//
void strip_whitespace(char *str) {
int n;
while (1) {
if (!str[0]) break;
if (!isascii(str[0])) break;
if (!isspace(str[0])) break;
strcpy(str, str+1);
}
while (1) {
n = (int)strlen(str);
if (n == 0) break;
if (!isascii(str[n-1])) break;
if (!isspace(str[n-1])) break;
str[n-1] = 0;
}
}
void strip_whitespace(string& str) {
int n;
while (1) {
if (str.length() == 0) break;
if (!isascii(str[0])) break;
if (!isspace(str[0])) break;
str.erase(0, 1);
}
while (1) {
n = (int)str.length();
if (n == 0) break;
if (!isascii(str[n-1])) break;
if (!isspace(str[n-1])) break;
str.erase(n-1, 1);
}
}
char* time_to_string(double t) {
static char buf[100];
time_t x = (time_t)t;
struct tm* tm = localtime(&x);
strftime(buf, sizeof(buf)-1, "%d-%b-%Y %H:%M:%S", tm);
return buf;
}
char* precision_time_to_string(double t) {
static char buf[100];
char finer[16];
int hundreds_of_microseconds=(int)(10000*(t-(int)t));
if (hundreds_of_microseconds == 10000) {
// paranoia -- this should never happen!
//
hundreds_of_microseconds=0;
t+=1.0;
}
time_t x = (time_t)t;
struct tm* tm = localtime(&x);
strftime(buf, sizeof(buf)-1, "%Y-%m-%d %H:%M:%S", tm);
sprintf(finer, ".%04d", hundreds_of_microseconds);
strcat(buf, finer);
return buf;
}
string timediff_format(double diff) {
char buf[256];
int tdiff = (int)diff;
int sex = tdiff % 60;
tdiff /= 60;
if (!tdiff) {
sprintf(buf, "%d sec", sex);
return buf;
}
int min = tdiff % 60;
tdiff /= 60;
if (!tdiff) {
sprintf(buf, "%d min %d sec", min, sex);
return buf;
}
int hours = tdiff % 24;
tdiff /= 24;
if (!tdiff) {
sprintf(buf, "%d hr %d min %d sec", hours, min, sex);
return buf;
}
int days = tdiff % 7;
tdiff /= 7;
if (!tdiff) {
sprintf(buf, "%d days %d hr %d min %d sec", days, hours, min, sex);
return buf;
}
sprintf(buf, "%d weeks %d days %d hrs %d min %d sec", (int)tdiff, days, hours, min, sex);
return buf;
}
void mysql_timestamp(double dt, char* p) {
struct tm* tmp;
time_t t = (time_t)dt;
tmp = localtime(&t); // MySQL timestamps are in local time
sprintf(p, "%4d%02d%02d%02d%02d%02d",
tmp->tm_year+1900, tmp->tm_mon+1, tmp->tm_mday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec
);
}
// Return a text-string description of a given error.
// Must be kept consistent with error_numbers.h
//
const char* boincerror(int which_error) {
switch (which_error) {
case BOINC_SUCCESS: return "Success";
case ERR_SELECT: return "select() failed";
case ERR_MALLOC: return "malloc() failed";
case ERR_READ: return "read() failed";
case ERR_WRITE: return "write() failed";
case ERR_FREAD: return "fread() failed";
case ERR_FWRITE: return "fwrite() failed";
case ERR_IO: return "system I/O error";
case ERR_CONNECT: return "connect() failed";
case ERR_FOPEN: return "fopen() failed";
case ERR_RENAME: return "rename() failed";
case ERR_UNLINK: return "unlink() failed";
case ERR_OPENDIR: return "opendir() failed";
case ERR_XML_PARSE: return "unexpected XML tag or syntax";
case ERR_GETHOSTBYNAME: return "can't resolve hostname";
case ERR_GIVEUP_DOWNLOAD: return "file download timed out";
case ERR_GIVEUP_UPLOAD: return "file upload timed out";
case ERR_NULL: return "unexpected null pointer";
case ERR_NEG: return "unexpected negative value";
case ERR_BUFFER_OVERFLOW: return "buffer overflow";
case ERR_MD5_FAILED: return "md5 checksum failed for file";
case ERR_RSA_FAILED: return "RSA key check failed for file";
case ERR_OPEN: return "open() failed";
case ERR_DUP2: return "dup() failed";
case ERR_NO_SIGNATURE: return "no signature";
case ERR_THREAD: return "thread failure";
case ERR_SIGNAL_CATCH: return "caught signal";
case ERR_UPLOAD_TRANSIENT: return "transient upload error";
case ERR_UPLOAD_PERMANENT: return "permanent upload error";
case ERR_IDLE_PERIOD: return "user preferences say can't start work";
case ERR_ALREADY_ATTACHED: return "already attached to project";
case ERR_FILE_TOO_BIG: return "file size too big";
case ERR_GETRUSAGE: return "getrusage() failed";
case ERR_BENCHMARK_FAILED: return "benchmark failed";
case ERR_BAD_HEX_FORMAT: return "hex format key data bad";
case ERR_DB_NOT_FOUND: return "no database rows found in lookup/enumerate";
case ERR_DB_NOT_UNIQUE: return "database lookup not unique";
case ERR_DB_CANT_CONNECT: return "can't connect to database";
case ERR_GETS: return "gets()/fgets() failedj";
case ERR_SCANF: return "scanf()/fscanf() failed";
case ERR_READDIR: return "readdir() failed";
case ERR_SHMGET: return "shmget() failed";
case ERR_SHMCTL: return "shmctl() failed";
case ERR_SHMAT: return "shmat() failed";
case ERR_FORK: return "fork() failed";
case ERR_EXEC: return "exec() failed";
case ERR_NOT_EXITED: return "process didn't exit";
case ERR_NOT_IMPLEMENTED: return "system call not implemented";
case ERR_GETHOSTNAME: return "gethostname() failed";
case ERR_NETOPEN: return "netopen() failed";
case ERR_SOCKET: return "socket() failed";
case ERR_FCNTL: return "fcntl() failed";
case ERR_AUTHENTICATOR: return "authentication error";
case ERR_SCHED_SHMEM: return "scheduler shared memory contents bad";
case ERR_ASYNCSELECT: return "async select() failed";
case ERR_BAD_RESULT_STATE: return "bad result state";
case ERR_DB_CANT_INIT: return "can't init database";
case ERR_NOT_UNIQUE: return "state files have redundant entries";
case ERR_NOT_FOUND: return "not found";
case ERR_NO_EXIT_STATUS: return "no exit status in scheduler request";
case ERR_FILE_MISSING: return "file missing";
case ERR_SEMGET: return "semget() failed";
case ERR_SEMCTL: return "semctl() failed";
case ERR_SEMOP: return "semop() failed";
case ERR_FTOK: return "ftok() failed";
case ERR_SOCKS_UNKNOWN_FAILURE: return "SOCKS: unknown error";
case ERR_SOCKS_REQUEST_FAILED: return "SOCKS: request failed";
case ERR_SOCKS_BAD_USER_PASS: return "SOCKS: bad user password";
case ERR_SOCKS_UNKNOWN_SERVER_VERSION: return "SOCKS: unknown server version";
case ERR_SOCKS_UNSUPPORTED: return "SOCKS: unsupported";
case ERR_SOCKS_CANT_REACH_HOST: return "SOCKS: can't reach host";
case ERR_SOCKS_CONN_REFUSED: return "SOCKS: connection refused";
case ERR_TIMER_INIT: return "timer init";
case ERR_RSC_LIMIT_EXCEEDED: return "resource limit exceeded";
case ERR_INVALID_PARAM: return "invalid parameter";
case ERR_SIGNAL_OP: return "signal op";
case ERR_BIND: return "bind() failed";
case ERR_LISTEN: return "listen() failed";
case ERR_TIMEOUT: return "timeout";
case ERR_PROJECT_DOWN: return "project down";
case ERR_HTTP_ERROR: return "HTTP error";
case ERR_RESULT_START: return "result start failed";
case ERR_RESULT_DOWNLOAD: return "result download failed";
case ERR_RESULT_UPLOAD: return "result upload failed";
case ERR_INVALID_URL: return "invalid URL";
case ERR_MAJOR_VERSION: return "bad major version";
case ERR_NO_OPTION: return "no option";
case ERR_MKDIR: return "mkdir() failed";
case ERR_INVALID_EVENT: return "invalid event";
case ERR_ALREADY_RUNNING: return "already running";
case ERR_NO_APP_VERSION: return "no app version";
case ERR_WU_USER_RULE: return "user already did result for this workunit";
case ERR_ABORTED_VIA_GUI: return "result aborted via GUI";
case ERR_INSUFFICIENT_RESOURCE: return "insufficient resources";
case ERR_RETRY: return "retry";
case ERR_WRONG_SIZE: return "wrong size";
case ERR_USER_PERMISSION: return "user permission";
case ERR_BAD_EMAIL_ADDR: return "bad email address";
case ERR_BAD_PASSWD: return "bad password";
case ERR_SHMEM_NAME: return "can't get shared mem segment name";
case ERR_NO_NETWORK_CONNECTION: return "no available network connection";
case ERR_IN_PROGRESS: return "operation in progress";
case ERR_ACCT_CREATION_DISABLED: return "account creation disabled";
case ERR_ATTACH_FAIL_INIT: return "Couldn't start master page download";
case ERR_ATTACH_FAIL_DOWNLOAD: return "Couldn't download master page";
case ERR_ATTACH_FAIL_PARSE: return "Couldn't parse master page";
case ERR_ATTACH_FAIL_BAD_KEY: return "Invalid account key";
case ERR_ATTACH_FAIL_FILE_WRITE: return "Couldn't write account file";
case ERR_FFLUSH: return "fflush() failed";
case ERR_FSYNC: return "fsync() failed";
case ERR_TRUNCATE: return "truncate() failed";
case ERR_ABORTED_BY_PROJECT: return "Aborted by project";
case ERR_GETGRNAM: return "getgrnam() failed";
case ERR_CHOWN: return "chown() failed";
case ERR_FILE_NOT_FOUND: return "file not found";
case ERR_BAD_FILENAME: return "file name is empty or has '..'";
case ERR_TOO_MANY_EXITS: return "application exited too many times";
case ERR_RMDIR: return "rmdir() failed";
case ERR_SYMLINK: return "symlink() failed";
case ERR_DB_CONN_LOST: return "DB connection lost during enumeration";
case ERR_CRYPTO: return "encryption error";
case ERR_ABORTED_ON_EXIT: return "job was aborted on client exit";
case ERR_UNSTARTED_LATE: return "job is unstarted and past deadline";
case ERR_MISSING_COPROC: return "an expected GPU was not found";
case ERR_PROC_PARSE: return "a /proc entry was not parsed correctly";
case 404: return "HTTP file not found";
case 407: return "HTTP proxy authentication failure";
case 416: return "HTTP range request error";
case 500: return "HTTP internal server error";
case 501: return "HTTP not implemented";
case 502: return "HTTP bad gateway";
case 503: return "HTTP service unavailable";
case 504: return "HTTP gateway timeout";
}
static char buf[128];
sprintf(buf, "Error %d", which_error);
return buf;
}
const char* network_status_string(int n) {
switch (n) {
case NETWORK_STATUS_ONLINE: return "online";
case NETWORK_STATUS_WANT_CONNECTION: return "need connection";
case NETWORK_STATUS_WANT_DISCONNECT: return "don't need connection";
case NETWORK_STATUS_LOOKUP_PENDING: return "reference site lookup pending";
default: return "unknown";
}
}
const char* rpc_reason_string(int reason) {
switch (reason) {
case RPC_REASON_USER_REQ: return "Requested by user";
case RPC_REASON_NEED_WORK: return "To fetch work";
case RPC_REASON_RESULTS_DUE: return "To report completed tasks";
case RPC_REASON_TRICKLE_UP: return "To send trickle-up message";
case RPC_REASON_ACCT_MGR_REQ: return "Requested by account manager";
case RPC_REASON_INIT: return "Project initialization";
case RPC_REASON_PROJECT_REQ: return "Requested by project";
default: return "Unknown reason";
}
}
const char* suspend_reason_string(int reason) {
switch (reason) {
case SUSPEND_REASON_BATTERIES: return "on batteries";
case SUSPEND_REASON_USER_ACTIVE: return "computer is in use";
case SUSPEND_REASON_USER_REQ: return "user request";
case SUSPEND_REASON_TIME_OF_DAY: return "time of day";
case SUSPEND_REASON_BENCHMARKS: return "CPU benchmarks in progress";
case SUSPEND_REASON_DISK_SIZE: return "need disk space - check preferences";
case SUSPEND_REASON_NO_RECENT_INPUT: return "no recent user activity";
case SUSPEND_REASON_INITIAL_DELAY: return "initial delay";
case SUSPEND_REASON_EXCLUSIVE_APP_RUNNING: return "an exclusive app is running";
case SUSPEND_REASON_CPU_USAGE: return "CPU is busy";
case SUSPEND_REASON_NETWORK_QUOTA_EXCEEDED: return "network bandwidth limit exceeded";
}
return "unknown reason";
}
#ifdef WIN32
// get message for last error
//
char* windows_error_string(char* pszBuf, int iSize) {
DWORD dwRet;
LPSTR lpszTemp = NULL;
dwRet = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_ARGUMENT_ARRAY,
NULL,
GetLastError(),
LANG_NEUTRAL,
(LPSTR)&lpszTemp,
0,
NULL
);
// supplied buffer is not long enough
if ( !dwRet || ( (long)iSize < (long)dwRet+14 ) ) {
pszBuf[0] = '\0';
} else {
lpszTemp[lstrlenA(lpszTemp)-2] = '\0'; //remove cr and newline character
sprintf ( pszBuf, "%s (0x%x)", lpszTemp, GetLastError() );
}
if ( lpszTemp ) {
LocalFree((HLOCAL) lpszTemp );
}
return pszBuf;
}
// get message for given error
//
char* windows_format_error_string(
unsigned long dwError, char* pszBuf, int iSize
) {
DWORD dwRet;
LPSTR lpszTemp = NULL;
dwRet = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_ARGUMENT_ARRAY,
NULL,
dwError,
LANG_NEUTRAL,
(LPSTR)&lpszTemp,
0,
NULL
);
// supplied buffer is not long enough
if ( !dwRet || ( (long)iSize < (long)dwRet+14 ) ) {
pszBuf[0] = '\0';
} else {
lpszTemp[lstrlenA(lpszTemp)-2] = '\0'; //remove cr and newline character
sprintf( pszBuf, "%s (0x%x)", lpszTemp, dwError );
}
if ( lpszTemp ) {
LocalFree((HLOCAL) lpszTemp );
}
return pszBuf;
}
#endif
// string substitution:
// haystack is the input string
// out is the output buffer
// out_len is the length of the output buffer
// needle is string to search for within the haystack
// target is string to replace with
//
int string_substitute(
const char* haystack, char* out, int out_len,
const char* needle, const char* target
) {
int i=0, j=0;
int needle_len = (int)strlen(needle);
int target_len = (int)strlen(target);
int retval = 0;
while (haystack[i]) {
if (j+target_len >= out_len-1) {
retval = ERR_BUFFER_OVERFLOW;
break;
}
if (!strncmp(&haystack[i], needle, needle_len)){
strcpy(out+j, target);
i += (int)strlen(needle);
j += (int)strlen(target);
} else {
out[j++] = haystack[i++];
}
}
out[j] = 0;
return retval;
}
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