commit 5e45486debf9867f57ba6a8818eaadde9d3e8991 Author: Gitea Date: Tue Feb 11 23:30:50 2020 -0600 Initial version of utils up to 2020-02-11 diff --git a/README b/README new file mode 100755 index 0000000..e69de29 diff --git a/asa.c b/asa.c new file mode 100755 index 0000000..7a0072b --- /dev/null +++ b/asa.c @@ -0,0 +1,45 @@ +#include +#include + +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; +} diff --git a/cat.c b/cat.c new file mode 100755 index 0000000..dfbc980 --- /dev/null +++ b/cat.c @@ -0,0 +1,35 @@ +#include +#include + +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; +} diff --git a/cksum.c b/cksum.c new file mode 100755 index 0000000..edee16f --- /dev/null +++ b/cksum.c @@ -0,0 +1,123 @@ +#include +#include + +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; +} diff --git a/cmp.c b/cmp.c new file mode 100755 index 0000000..e477566 --- /dev/null +++ b/cmp.c @@ -0,0 +1,118 @@ +#include +#include +#include + +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; + } + } +} diff --git a/dc.c b/dc.c new file mode 100755 index 0000000..f8605e1 --- /dev/null +++ b/dc.c @@ -0,0 +1,6 @@ +#include +#include + +int main(void) { + +} diff --git a/echo.c b/echo.c new file mode 100755 index 0000000..3225bf9 --- /dev/null +++ b/echo.c @@ -0,0 +1,77 @@ +#include + +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; + } +} diff --git a/expand.c b/expand.c new file mode 100755 index 0000000..b4a54ba --- /dev/null +++ b/expand.c @@ -0,0 +1,181 @@ +#include +#include +#include + +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; +} diff --git a/fenver.c b/fenver.c new file mode 100755 index 0000000..93dbe25 --- /dev/null +++ b/fenver.c @@ -0,0 +1,7 @@ +#include + +/* TODO: Make this check the kernel for version instead */ +int main(void) { + printf("FENIX PRE_REL 20190903\n"); + return 0; +} diff --git a/head.c b/head.c new file mode 100755 index 0000000..08b5fa3 --- /dev/null +++ b/head.c @@ -0,0 +1,89 @@ +#include +#include +#include + +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; +} diff --git a/ln.c b/ln.c new file mode 100755 index 0000000..15b7767 --- /dev/null +++ b/ln.c @@ -0,0 +1,117 @@ +#include +#include +#include +#include +#include +#include +#include + +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); + } +} diff --git a/pwd.c b/pwd.c new file mode 100755 index 0000000..162b1f6 --- /dev/null +++ b/pwd.c @@ -0,0 +1,31 @@ +#include +#include +#include + +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; +} diff --git a/sh.c b/sh.c new file mode 100755 index 0000000..0791282 --- /dev/null +++ b/sh.c @@ -0,0 +1,128 @@ +#include +#include +#include +#include +#include +#include +#include +#include + +#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); +} diff --git a/tty.c b/tty.c new file mode 100755 index 0000000..4831e10 --- /dev/null +++ b/tty.c @@ -0,0 +1,14 @@ +#include +#include +#include + +int main() { + if(isatty(fileno(stdin))) { + printf("%s\n", ttyname(0)); + return 0; + } + else { + printf("not a tty\n"); + return 1; + } +} diff --git a/wc.c b/wc.c new file mode 100755 index 0000000..9ceee26 --- /dev/null +++ b/wc.c @@ -0,0 +1,141 @@ +#include +#include + +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; +}