auravulpes/FENIX_coreutils
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Initial version of utils up to 2020-02-11

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Gitea 2020-02-11 23:30:50 -06:00
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0
README Executable file
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45
asa.c Executable file
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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char ** argv) {
FILE *in_file;
int i, error = 0, eof_reached = 0;
char c, c_temp;
for(i = 1; i < argc; i++) {
if(argv[i][0] == '-' && argv[i][1] == '\0')
in_file = stdin;
else {
in_file = fopen(argv[i], "r");
if(in_file == NULL) {
fprintf(stderr, "Cannot find file %s\n", argv[i]);
error = 1;
continue;
}
}
eof_reached = 0;
while(!eof_reached) {
c = fgetc(in_file);
switch(c) {
case '1': printf("\f"); break;
case '0': printf("\n"); break;
case '+': printf("\r"); break;
case EOF: eof_reached = 1; continue;
}
for(c_temp = fgetc(in_file); c_temp != '\n'; c_temp = fgetc(in_file)) {
if(c_temp == EOF) {
eof_reached = 1;
break;
}
else
printf("%c", c_temp);
}
}
printf("\n");
}
if(error)
return 1;
else
return 0;
}

35
cat.c Executable file
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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
FILE * in_file;
int i, error = 0;
char c;
if(argc == 1) {
in_file = stdin;
for(c = fgetc(in_file); c != EOF; c = fgetc(in_file)) {
fprintf(stdout, "%c", c);
}
}
for(i = 1; i < argc; i++) {
if(argv[i][0] == '-' && argv[i][1] == '\0')
in_file = stdin;
else {
in_file = fopen(argv[i], "r");
if(in_file == NULL) {
fprintf(stderr, "Cannot find file %s\n", argv[i]);
error = 1;
continue;
}
}
for(c = fgetc(in_file); c != EOF; c = fgetc(in_file))
fprintf(stdout, "%c", c);
}
if(error)
return 1;
else
return 0;
}

123
cksum.c Executable file
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#include <stdio.h>
#include <stdlib.h>
unsigned int crc32(FILE * in_file);
int count_octets(FILE * in_file);
unsigned int crc32_table[256] = {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};
int main(int argc, char ** argv) {
int i, error = 0;
FILE *in_file;
for(i = 1; i < argc; i++) {
in_file = fopen(argv[i], "r");
if(in_file == NULL) {
error = 1;
fprintf(stderr, "Cannot find file %s\n", argv[i]);
}
else
printf("%u %d %s\n", crc32(current_file), count_octets(current_file),
argv[i]);
}
if(error)
return 1;
else
return 0;
}
//Based off CRC-32 on the Wikipedia article for CRC
unsigned int crc32(FILE * in_file) {
unsigned int crc = 0xffffffff;
int nLookupIndex;
char c;
fseek(in_file, 0, SEEK_SET);
for(c = fgetc(in_file); c != EOF; c = fgetc(in_file)) {
nLookupIndex = (crc ^ c) & 0xff;
crc = (crc >> 8) ^ crc32_table[nLookupIndex];
}
crc ^= 0xffffffff;
return crc;
}
int count_octets(FILE * in_file) {
int total_octets = 0;
char c;
fseek(in_file, 0, SEEK_SET);
for(c = fgetc(in_file); c != EOF; c = fgetc(in_file))
total_octets++;
return total_octets;
}

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cmp.c Executable file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char ** argv) {
int silent_mode = 0;
int print_all_diff = 0;
int keep_printing = 1;
int files_differ = 0;
int i, f1num = 1;
FILE *file1, *file2;
char c1, c2;
int line = 1, byte = 1;
if(argv[1][0] == '-' && argv[1][1] == 's' && argv[1][2] == '\0') {
silent_mode = 1;
f1num++;
if(argv[2][0] == '-' && argv[2][1] == 'l' &&
argv[2][2] == '\0') {
f1num++;
}
}
else if(argv[1][0] == '-' && argv[1][1] == 'l' &&
argv[1][2] == '\0') {
print_all_diff = 1;
f1num++;
if(argv[2][0] == '-' && argv[2][1] == 's' &&
argv[2][2] == '\0') {
f1num++;
}
}
if(strcmp(argv[f1num], "-") == 0 && strcmp(argv[f1num+1], "-") == 0) {
fprintf(stderr, "%s: Cannot accept stdin for both files\n", argv[0]);
return 2;
}
else if(strcmp(argv[f1num], "-") == 0) {
file1 = stdin;
file2 = fopen(argv[f1num+1], "r");
}
else if(strcmp(argv[f1num+1], "-") == 0) {
file1 = fopen(argv[f1num], "r");
file2 = stdin;
}
else {
file1 = fopen(argv[f1num], "r");
file2 = fopen(argv[f1num+1], "r");
}
if(silent_mode) {
c1 = fgetc(file1);
c2 = fgetc(file2);
for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
if(c1 != c2) {
return 1;
}
c1 = fgetc(file1);
c2 = fgetc(file2);
}
if(c1 != c2) {
return 1;
}
else {
return 0;
}
}
else if(print_all_diff) {
c1 = fgetc(file1);
c2 = fgetc(file2);
for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
if(c1 != c2) {
printf("%d %o %o\n", byte, c1, c2);
files_differ = 1;
}
c1 = fgetc(file1);
c2 = fgetc(file2);
line++;
byte++;
}
if(c1 != c2) {
fprintf(stderr, "%s: EOF on %s%s\n", argv[0],
c1 == EOF ? argv[f1num] : argv[f1num+1], "");
return 1;
}
else if(files_differ) {
return 1;
}
else {
return 0;
}
}
else {
c1 = fgetc(file1);
c2 = fgetc(file2);
for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
if(c1 != c2 && keep_printing) {
keep_printing = 0;
printf("%s %s differ: char %d, line %d\n", argv[f1num], argv[f1num+1], byte, line);
files_differ = 1;
}
c1 = fgetc(file1);
c2 = fgetc(file2);
if(c1 == '\n') line++;
byte++;
}
if(c1 != c2) {
fprintf(stderr, "%s: EOF on %s%s\n", argv[0],
c1 == EOF ? argv[f1num] : argv[f1num+1], "");
return 1;
}
else if(files_differ) {
return 1;
}
else {
return 0;
}
}
}

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dc.c Executable file
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#include <stdio.h>
#include <stdlib.h>
int main(void) {
}

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echo.c Executable file
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#include <stdio.h>
int ctoi(char c);
int main(int argc, char ** argv) {
int i, j, oct_temp;
char char_temp;
int trailing_newline = 1; //1 if true, 0 if \c present
for(i = 1; i < argc; i++) {
for(j = 0; argv[i][j] != '\0'; j++) {
if(argv[i][j] == '\\') {
j++;
switch(argv[i][j]) {
case 'a': printf("\a"); break;
case 'b': printf("\b"); break;
case 'c': trailing_newline = 0; break;
case 'f': printf("\f"); break;
case 'n': printf("\n"); break;
case 'r': printf("\r"); break;
case 't': printf("\t"); break;
case 'v': printf("\v"); break;
case '\\': printf("\\"); break;
case '0': {
j++;
oct_temp = ctoi(argv[i][j]);
j++;
if(ctoi(argv[i][j] != -1)) {
oct_temp *= 8;
oct_temp += ctoi(argv[i][j]);
j++;
if(ctoi(argv[i][j] != -1)) {
oct_temp *= 8;
oct_temp += ctoi(argv[i][j]);
}
else {
j--;
}
}
else {
j--;
}
printf("%c", (char)oct_temp);
}
break;
default: printf("\\%c", argv[i][j]);
break;
}
}
else {
printf("%c", argv[i][j]);
}
}
}
if(trailing_newline) {
printf("\n");
}
return 0;
}
int ctoi(char c) {
switch(c) {
case '0': return 0;
case '1': return 1;
case '2': return 2;
case '3': return 3;
case '4': return 4;
case '5': return 5;
case '6': return 6;
case '7': return 7;
case '8': return 8;
case '9': return 9;
default: return -1;
}
}

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expand.c Executable file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int is_integer(char * str);
int is_comma_list(char * str);
int * comma_list_stops(char * str);
int comma_list_num_stops(char * str);
int stoi_mini(char * str);
int main(int argc, char ** argv) {
int *tab_stops;
int col_pos, num_tab_stops = 0, cur_stop;
FILE *current_file;
int i = 1, j; char c;
int all_good = 1;
if(argv[1][0] == '-' && argv[1][1] == 't' && argv[1][2] == '\0') {
i++;
j = 2;
if(is_comma_list(argv[j])) {
num_tab_stops = comma_list_num_stops(argv[j]);
tab_stops = comma_list_stops(argv[j]);
i++;
}
else {
while(is_integer(argv[j]) && j < (argc - 1)) {
num_tab_stops++;
i++;
j++;
}
tab_stops = calloc(num_tab_stops, sizeof(*tab_stops));
for(j = 2; j < num_tab_stops + 2; j++) {
tab_stops[j-2] = stoi_mini(argv[j]);
}
}
}
else if(argv[1][0] == '-' && argv[1][1] == 't' &&
argv[1][2] <= '9' && argv[1][2] >= '0'){
char * str = strtok(argv[1], "t");
str = strtok(NULL, "\0");
num_tab_stops = comma_list_num_stops(str);
tab_stops = comma_list_stops(str);
i++;
}
else {
tab_stops = malloc(sizeof(*tab_stops));
*tab_stops = 8;
num_tab_stops = 1;
}
for(i = i; i < argc; i++) {
current_file = fopen(argv[i], "r");
if(current_file == NULL) {
fprintf(stderr, "%s: %s: No such file or directory\n", argv[0], argv[i]);
all_good = 0;
}
else {
cur_stop = 0; col_pos = 0;
for(c = fgetc(current_file); c != EOF; c = fgetc(current_file)) {
if(c == '\t') {
if(num_tab_stops == 1) {
cur_stop++;
printf(" "); col_pos++;
while(col_pos % *tab_stops != 0) {
printf(" "); col_pos++;
}
}
else {
if(cur_stop >= num_tab_stops) {
printf(" ");
col_pos++;
cur_stop++;
}
else {
printf(" "); col_pos++;
while(col_pos % tab_stops[cur_stop] != 0) {
printf(" "); col_pos++;
}
cur_stop++;
}
}
}
else if(c == '\n') {
printf("%c", c);
col_pos = 0;
cur_stop = 0;
}
else {
printf("%c", c);
col_pos++;
}
}
fclose(current_file);
}
}
}
int is_integer(char * str) {
int i = 0;
while(str[i] != '\0' && str[i] != ',') {
if(str[i] > 57 || str[i] < 48) {
return 0;
}
i++;
}
return 1;
}
int is_comma_list(char * str) {
int i = 0, has_comma = 0;
while(str[i] != '\0') {
if((str[i] > 57 || str[i] < 48) && str[i] != ',') {
return 0;
}
if(str[i] == ',') {
has_comma = 1;
}
i++;
}
return has_comma;
}
int stoi_mini(char * str) {
int i, str_int = 0;
for(i = 0; str[i] != '\0' && str[i] != ','; i++) {
str_int *= 10;
switch(str[i]) {
case '0': str_int += 0; break;
case '1': str_int += 1; break;
case '2': str_int += 2; break;
case '3': str_int += 3; break;
case '4': str_int += 4; break;
case '5': str_int += 5; break;
case '6': str_int += 6; break;
case '7': str_int += 7; break;
case '8': str_int += 8; break;
case '9': str_int += 9; break;
default: return -1;
}
}
return str_int;
}
int comma_list_num_stops(char * str) {
int num_stops = 0;
for(int i = 0; str[i] != '\0'; i++) {
if(str[i] == ',') {
num_stops++;
}
}
return num_stops;
}
int * comma_list_stops(char * str) {
int * tab_stops;
int num_stops = comma_list_num_stops(str), i;
tab_stops = calloc(num_stops, sizeof(*tab_stops));
char * stop = strtok(str, ",");
i = 0;
while(stop != NULL && i < num_stops) {
tab_stops[i] = stoi_mini(stop);
i++;
stop = strtok(NULL, ",");
}
return tab_stops;
}

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fenver.c Executable file
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#include <stdio.h>
/* TODO: Make this check the kernel for version instead */
int main(void) {
printf("FENIX PRE_REL 20190903\n");
return 0;
}

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head.c Executable file
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int stoi_mini(char * str);
int main(int argc, char *argv[]) {
FILE * current_input_file;
int i = 1, j = 0; char c;
int chars_copy = 10;
int print_head = 0;
int error_occurred;
if(argv[i][0] == '-') {
if(argv[i][1] == 'n') {
i++;
chars_copy = stoi_mini(argv[i]);
i++;
}
}
if(argc - i > 1) {
print_head = 1;
}
for(i; i < argc; i++) {
if(argv[i][0] == '-' && argv[i][1] == '\0') {
current_input_file = stdin;
}
else {
current_input_file = fopen(argv[i], "r");
if(current_input_file == NULL) {
fprintf(stderr, "%s: %s: No such file or directory\n",
argv[0], argv[i]);
error_occurred = 1;
}
}
if(print_head) {
printf("\n==> %s <==\n", argv[i]);
}
j = 0;
c = ' ';
while(c != EOF && j < chars_copy) {
c = fgetc(current_input_file);
if(c == '\n') {
j++;
}
if(c != EOF) {
fprintf(stdout, "%c", c);
}
}
if(current_input_file != stdin) {
fclose(current_input_file);
}
}
if(error_occurred) {
return 1;
}
else {
return 0;
}
}
int stoi_mini(char * str) {
int i, str_int = 0;
for(i = 0; str[i] != '\0' && str[i] != ','; i++) {
str_int *= 10;
switch(str[i]) {
case '0': str_int += 0; break;
case '1': str_int += 1; break;
case '2': str_int += 2; break;
case '3': str_int += 3; break;
case '4': str_int += 4; break;
case '5': str_int += 5; break;
case '6': str_int += 6; break;
case '7': str_int += 7; break;
case '8': str_int += 8; break;
case '9': str_int += 9; break;
default: return -1;
}
}
return str_int;
}

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ln.c Executable file
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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
int link_file(char *, char *);
int force = 0; /* -f flag */
int do_symlink = 0; /* -s flag */
int follow_link = 0; /* -L/-P flag */
int main(int argc, char * argv[]) {
int file_start = 1;
int source_count = 0;
char * path_dir;
char * ln_name;
if(argc < 3) {
fprintf(stderr, "%s: missing file operand\n", argv[0]);
exit(1);
}
if(strcmp(argv[file_start], "-L") == 0) {
follow_link = AT_SYMLINK_FOLLOW;
file_start++;
}
else if(strcmp(argv[file_start], "-P") == 0) {
follow_link = 0;
file_start++;
}
if(strcmp(argv[file_start], "-f") == 0) {
force = 1;
file_start++;
}
else if(strcmp(argv[file_start], "-s") == 0) {
do_symlink = 1;
file_start++;
}
else if(strcmp(argv[file_start], "-fs") == 0
|| strcmp(argv[file_start], "-sf") == 0) {
force = 1;
do_symlink = 1;
file_start++;
}
if(strcmp(argv[file_start], "-L") == 0) {
follow_link = AT_SYMLINK_FOLLOW;
file_start++;
}
else if(strcmp(argv[file_start], "-P") == 0) {
follow_link = 0;
file_start++;
}
if((argc - file_start) < 2) {
fprintf(stderr, "%s: missing file operand\n", argv[0]);
exit(1);
}
source_count = argc - (file_start + 1);
if(source_count == 1) {
int ret = link_file(argv[file_start], argv[file_start+1]);
if(ret == 1) {
fprintf(stderr, "%s: failed to create link '%s': File exists\n",
argv[0], argv[file_start + 1]);
exit(1);
}
return 0;
}
else {
path_dir = argv[argc - 1];
for(int i = file_start; i < (argc - 1); i++) {
int length = strlen(path_dir);
length += strlen(argv[i]);
ln_name = calloc(length + 2, sizeof(*ln_name));
strcpy(ln_name, path_dir);
strcat(ln_name, "/");
strcat(ln_name, argv[i]);
int ret = link_file(argv[i], ln_name);
if(ret == 1) {
fprintf(stderr, "%s: failed to create link '%s': File exists\n",
argv[0], ln_name);
exit(1);
}
free(ln_name);
}
}
}
int link_file(char * source, char * dest) {
struct stat buf;
lstat(source, &buf);
if(strcmp(source, dest) == 0 && !force) {
return 1;
}
else if(access(dest, F_OK) != -1 && !force) {
return 1;
}
else if(access(dest, F_OK) != -1 && force) {
unlink(dest);
}
if(do_symlink) {
return symlink(source, dest);
}
else if(S_ISLNK(buf.st_mode)) {
return linkat(AT_FDCWD, source, AT_FDCWD, dest, follow_link);
}
else {
return link(source, dest);
}
}

31
pwd.c Executable file
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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char * argv[]) {
int mode = 01; /* 01: print PWD -L, 02: print physical path -P */
if(argc > 1) {
for(int i = 1; i < argc; i++) {
if(argv[i][1] == 'L' && argv[i][2] == '\0') {
mode = 01;
}
else if(argv[i][1] == 'P' && argv[i][2] == '\0') {
mode = 02;
}
else {
fprintf(stderr, "%s: invalid option: %s\n", argv[0], argv[i]);
exit(1);
}
}
}
if(mode == 01) {
printf("%s\n", getenv("PWD"));
}
else {
printf("%s\n", getcwd(NULL, 0));
}
return 0;
}

128
sh.c Executable file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <linux/limits.h>
#include <signal.h>
#include <libgen.h>
#define ARG_SEP " " //Argument separator for commands
#define PROMPT " $ "
char** create_argv(char* command);
int get_argc(char* command);
char* prompt();
int cd(char* path);
int main() {
char** argv; //The command with arguments
char* user_input;
pid_t child_pid;
int stat_loc; //??? (Needed for waitpid)
signal(SIGINT, SIG_IGN); //Tell vsh to ignore SIGINT (^C)
while(1) {
user_input = prompt();
argv = create_argv(user_input);
if(strcmp(argv[0], "cd") == 0) {
if(cd(&user_input[3]) < 0) {
perror(argv[1]);
}
//causes the fork to get skipped
continue;
}
else if(strcmp(argv[0], "exit") == 0 ||
strcmp(argv[0], "quit") == 0) {
exit(0);
}
child_pid = fork();
if(child_pid < 0) {
//If the child couldn't run, assume no memory
perror("Out of memory");
exit(1);
}
else if(child_pid == 0) {
//If we are the child, allow ^C
signal(SIGINT, SIG_DFL);
if(execvp(argv[0], argv) < 0) {
perror(argv[0]);
exit(1);
}
}
else {
waitpid(child_pid, &stat_loc, WUNTRACED);
}
free(user_input);
free(argv);
}
return 0;
}
char** create_argv(char* command) {
int argc = get_argc(command) + 1;
char* temp;
int i = 0;
char** argv = calloc(argc, sizeof(*argv));
if(argv == NULL) {
//If couldn't allocate argv, assume no memory
perror("Out of memory");
exit(1);
}
for(temp = strtok(command, ARG_SEP); temp != NULL;
temp = strtok(NULL, ARG_SEP)) {
argv[i] = temp;
i++;
}
//Set last item in argv to NULL, since execvp requires it
argv[i] = NULL;
return argv;
}
char* prompt() {
char cwd[PATH_MAX];
getcwd(cwd, sizeof(cwd));
char* bname = basename(cwd);
char prompt[PATH_MAX + 5] = "";
strcat(prompt, bname);
strcat(prompt, PROMPT);
char* input = calloc(512, sizeof(*input));
if(input == NULL) {
//If input allocate failed, assume no memory
perror("Out of memory");
exit(1);
}
printf("%s", prompt);
fgets(input, 512, stdin);
//Is 512 enough? What about really long commands?
input[strcspn(input, "\r\n")] = '\0';
return input;
}
int get_argc(char* command) {
int argc = 0, word = 0;
char* command_iter = command;
do {
switch(*command_iter) {
case '\0':
case ' ':
case '\t': if(word) { word = 0; argc++; }
default: word = 1;
}
} while(*(command_iter++));
return argc;
}
int cd(char* path) {
return chdir(path);
}

14
tty.c Executable file
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@ -0,0 +1,14 @@
#include <unistd.h>
#include <stdio.h>
#include <string.h>
int main() {
if(isatty(fileno(stdin))) {
printf("%s\n", ttyname(0));
return 0;
}
else {
printf("not a tty\n");
return 1;
}
}

141
wc.c Executable file
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@ -0,0 +1,141 @@
#include <stdio.h>
#include <stdlib.h>
int count_words(FILE * file);
int count_newls(FILE * file);
int count_bytes(FILE * file);
int main(int argc, char ** argv) {
int flags = 0;
int c_byte = 0, c_nl = 0, c_word = 0;
int t_byte = 0, t_nl = 0, t_word = 0;
int i, fstart = 1;
FILE * in_file;
for(i = 1; i < argc; i++) {
if(argv[i][0] == '-') {
switch(argv[i][1]) {
case 'c': flags |= 04;fstart++; break;
case 'l': flags |= 01; fstart++; break;
case 'w': flags |= 02; fstart++; break;
default: break;
}
if(argv[i][2] != '\0') {
switch(argv[i][2]) {
case 'c': flags |= 04; break;
case 'l': flags |= 01; break;
case 'w': flags |= 02; break;
default: break;
}
if(argv[i][3] != '\0') {
switch(argv[i][3]) {
case 'c': flags |= 04; break;
case 'l': flags |= 01; break;
case 'w': flags |= 02; break;
default: break;
}
}
}
}
else break;
}
if((flags & 03) == 0) {
flags |= 04;
}
for(i = fstart; i < argc; i++) {
in_file = fopen(argv[i], "r");
if(in_file == NULL) {
fprintf(stderr, "Cannot find file %s\n", argv[i]);
continue;
}
if(flags & 04) {
c_byte = count_bytes(in_file);
t_byte += c_byte;
}
if(flags & 01) {
c_nl = count_newls(in_file);
t_nl += c_nl;
}
if(flags & 02) {
c_word = count_words(in_file);
t_word += c_word;
}
if(flags & 01) {
printf("%d ", c_nl);
}
if(flags & 02) {
printf("%d ", c_word);
}
if(flags & 04) {
printf("%d ", c_byte);
}
printf("%s\n", argv[i]);
fclose(in_file);
}
if((argc - fstart) > 1) {
if(flags & 01) {
printf("%d ", t_nl);
}
if(flags & 02) {
printf("%d ", t_word);
}
if(flags & 04) {
printf("%d ", t_byte);
}
printf("total\n");
}
}
int count_words(FILE * file) {
int ret_val = 0, in_word = 0;
char c;
fseek(file, 0, SEEK_SET);
for(c = fgetc(file); c != EOF; c = fgetc(file)) {
if(c != ' ' && c != '\t' && c != '\n') {
in_word = 1;
}
else if(in_word) {
ret_val++;
in_word = 0;
}
}
if(in_word) ret_val++;
return ret_val;
}
int count_newls(FILE * file) {
char c; int ret_val = 0;
fseek(file, 0, SEEK_SET);
for(c = fgetc(file); c != EOF; c = fgetc(file)) {
if(c == '\n') {
ret_val++;
}
}
return ret_val;
}
int count_bytes(FILE * file) {
char c; int ret_val = 0;
fseek(file, 0, SEEK_SET);
for(c = fgetc(file); c != EOF; c = fgetc(file)) {
ret_val++;
}
return ret_val;
}