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#include "shared.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
void* xcalloc(size_t nmemb, size_t size) {
void *mem = calloc(nmemb, size);
if(!mem)
XALLOC_EXIT("<xcalloc> Could not allocate memory");
return mem;
}
void* xreallocarray(void *ptr, size_t nmemb, size_t size) {
void *mem = reallocarray(ptr, nmemb, size);
if(mem == NULL)
XALLOC_EXIT("<xreallocarray> Could not allocate memory");
return mem;
}
int readwholebuffer(char **str, unsigned long int initsize, int fd) {
// Try to read bytes from fd into str
// Bytes read == 0, return 0
// Bytes read < 0, free string, return -1;
// When string hits capacity, double the capacity, and reallocate the string
char *lstr = NULL, *tmp = NULL;
ssize_t bytesread = -1;
int csize = initsize, ccap = initsize;
lstr = xcalloc(initsize, sizeof(char));
while((bytesread = read(fd, lstr + (csize - ccap), ccap)) > 0) {
ccap -= bytesread;
if(ccap <= 0) {
csize *= 2;
ccap = csize / 2;
tmp = realloc(lstr, csize * sizeof(char));
if(!tmp) {
if(___VXGG___VERBOSE_ERRORS___)
error(0, errno, "Could not reallocate enough space for lstr");
free(lstr);
lstr = NULL; // Need to set this because of the break
bytesread = -100;
break;
}
lstr = tmp;
}
}
if(bytesread < 0 && bytesread != -100) {
if(___VXGG___VERBOSE_ERRORS___)
error(0, errno, "Ran into a read() error");
free(lstr);
lstr = NULL;
}
if(lstr) {
tmp = realloc(lstr, csize - ccap + 1);
if(!tmp) {
if(___VXGG___VERBOSE_ERRORS___)
error(0, errno, "Could not shrink lstr after reading buffer");
free(lstr);
bytesread = -100;
}
lstr = tmp;
}
if(lstr && fd == STDIN_FILENO) {
lstr[csize - ccap - 1] = '\0'; // Don't include the newline
}
*str = lstr;
return ((bytesread == 0) ? (csize - ccap) : -1);
}
int writewholebuffer(int fd, const unsigned char *buf, int len) {
int total = 0;
int left = len;
int n;
while(total < len) {
if((n = write(fd, buf + total, left)) < 0)
break;
total += n;
left -= n;
}
return (n < 0) ? -1 : 0;
}
// Adapted from Beej's `sendall()` function
// https://beej.us/guide/bgnet/html/split/slightly-advanced-techniques.html#sendall
// Thanks Beej!
// dirname but less retarded hopefully
char *xdirname(const char * const path) {
char *tmp = NULL;
if(!path) { // Path being null is a special case which should return super early, before anything else
tmp = strdup(".");
if(!tmp)
XALLOC_EXIT("<xdirname> could not strdup \".\" for set path result \"NULL\"");
return tmp;
}
unsigned char flag = 0;
if(strcmp(path, ".") == 0) {tmp = strdup("."); flag++;}
if(strcmp(path, "/") == 0 && !flag) {tmp = strdup("/"); flag++;}
if(strcmp(path, "..") == 0 && !flag) {tmp = strdup("."); flag++;}
if(flag) {
if(!tmp)
XALLOC_EXIT("<xdirname> could not strdup a set path result");
return tmp;
}
/* From the manpages: (man 3 dirname)
// +=======================================+
// | path dirname basename |
// +=======================================+
// | /usr/lib /usr lib |
// | /usr/ / usr |
// | usr . usr |
// +=======================================+
*/
// Get a temp copy of the path for manipulation purposes
tmp = strdup(path);
if(!tmp)
XALLOC_EXIT("<xdirname> could not strdup the given path \"%s\" for internal manipulation", , path);
// If there's a trailing '/', delete it
size_t pathlen = strlen(path);
if(tmp[pathlen - 1] == '/') {
tmp[pathlen - 1] = '\0';
pathlen--;
}
// Ok, I think the easiest way to do this (if maybe a bit slow) is to count the number of '/'s in the string
// If there's only one, return '/'
// If there are 2 or more, find the last one in the list and set it to '\0'
size_t count = 0;
for(size_t i = 0; i < pathlen; i++) {
if(tmp[i] == '/')
count++;
}
if(count == 0) {
free(tmp);
tmp = strdup(".");
if(!tmp)
XALLOC_EXIT("<xdirname> could not strdup \".\" for set path result");
return tmp;
}
if(count == 1) {
free(tmp);
tmp = strdup("/");
if(!tmp)
XALLOC_EXIT("<xdirname> could not strdup \"/\" for set path result");
return tmp;
}
for(size_t i = 0, c2 = 0; i < pathlen; i++) {
if(tmp[i] == '/')
c2++;
if(c2 == count)
tmp[i] = '\0';
}
char * const actual = strdup(tmp);
if(!actual)
XALLOC_EXIT("<xdirname> could not strdup tmp string to make a shorter end string");
free(tmp);
return actual;
}
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