Util.c

// This article and all its includes are licenced under LGPL // GPL: [[[[1]]]] // SRC: [[[[2]]]] // included in [[[[3]]]][[[[4]]]]

int fileRead(char* filename) { }

int fileWrite(char* filename, char* content) { }

char *logAdd(char *msg) { // prepend with a timestamp // append to logfile printf(msg); printf("\n"); return msg; }

int logErr(char *msg) { logAdd(msg); // should prepend "ERROR:" return(errno = EXIT_FAILURE); }

// Same as logErr but allows error message to contain an arg

1. define logAddMsg logErrMsg

int logErrMsg(char *fmt, char *msg2) { char *msg = malloc(100); sprintf(msg,fmt,msg2); logErr(msg); free(msg); return(errno = EXIT_FAILURE); }

// Same as logErr but allows error message to contain an arg

1. define logAddNum logErrNum

int logErrNum(char *fmt, int num) { char *msg = malloc(100); sprintf(msg,fmt,num); logErr(msg); free(msg); return(errno = EXIT_FAILURE); }

// Return an array of strings resulting from splitting passed text at passed character // - the array is terminated by a NULL pointer char **split(char c,char *text) { int len = strlen(text), items = 0, size = 10; char **list = malloc(size); char *i = malloc(len+1), *j = i, *k = i, *item = i; while(*j++ = *text++); while(i <= k+len) { if (*i == c) *i = '\0'; if ((*i++ == '\0')&&strlen(item)) { if (items>size-2) realloc(list,size+=10); list[items++] = item; list[items] = NULL; item = i; } } return list; }

// Replaces missing itoa() and is specialised for binary return a string of \1 and \2 characters char *itob(int value, char *buf) { int i; char *j = buf; for (i=1; i<=value>>1; i<<=1) *j++ = value&i ? '\1' : '\2'; *j = '\0'; return buf; }

// ----------------------------------------------------------------------------------------- // // Global Pointer List // - use insertPointer() and removePointer() to access the dynamically allocating pointer-array // - internally uses freePush() and freePop() to maintain a linked-list of free array slots int psize = 100, pitem = 0; void **plist = NULL; typedef struct fi { int index; struct fi *next; } fitem; fitem *flist = NULL;

// add a new pointer to the list, try using slots from the free-list before extending array int insertPointer(void *ptr) { int index; if (plist == NULL) plist = malloc(psize*sizeof(void*)); if (flist) { fitem *kill = flist; flist = (fitem*)kill->next; index = kill->index; free(kill); } else if ((index = ++pitem) > psize) realloc(plist,psize += 100); plist[index] = ptr; return index; }

// push the index onto the free-list, returning the pointer at that index void *removePointer(int index) { fitem *newfree = (fitem*)malloc(sizeof(fitem)); newfree->next = flist ? flist : NULL; flist = newfree; return plist[newfree->index = index]; }

// Store the command-line args in the listSpace hash, eg char *name = *hash("name") void **hash(unsigned char*); void args(int argc, char **argv) {

int l = strlen(argv[1]); peer = strncpy(malloc(l+1),argv[1],l); while(argc-->2) { char **arg = split('=',argv[argc]); *hash(*arg) = arg[1]?strncpy(malloc(l=strlen(arg[1])+1),arg[1],l):"1"; free(arg); }

// Make a global peer name and port number char *p = *hash("port"); if (p) port = atoi(p);

#if __unix__ // Set name as seen in ps list if ux char *tmp = *argv; for (l=40;l--;) *tmp++ = '\0'; sprintf(*argv,"peerd: %s (http%d)",peer,port); #endif }