144 lines
2.7 KiB
C
144 lines
2.7 KiB
C
#include "command.h"
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#include "lslib.h"
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#include <stdlib.h>
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static long cast_long(const char* arg) {
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char* end;
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long l = strtol(arg, &end, 10);
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if (end == arg) {
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return 0;
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} else {
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return l;
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}
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}
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static double cast_double(const char* arg) {
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char* end;
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double d = strtod(arg, &end);
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if (end == arg) {
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return 0.0;
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} else {
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return d;
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}
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}
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#define NUMBER(name, type, arg) \
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long l = cast_long(arg); \
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type* t = (type*) &l; \
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type name = *t;
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static void handle_percent(char n, const char* arg) {
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switch (n) {
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case 'd':
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case 'z': {
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NUMBER(i, int, arg)
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printf("%d", i);
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break;
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}
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case 'u': {
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NUMBER(u, unsigned int, arg);
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printf("%u", u);
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break;
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}
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case 'f': {
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double d = cast_double(arg);
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printf("%f", d);
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break;
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}
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case 'c': {
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putchar(arg[0]);
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break;
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}
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case 's': {
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printf("%s", arg);
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break;
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}
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default: {
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putchar('%');
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putchar(n);
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}
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}
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}
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static void handle_slash(char n) {
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switch (n) {
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case 'n':
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putchar('\n');
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break;
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case 't':
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putchar('\t');
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break;
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case 'v':
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putchar('\v');
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break;
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case 'b':
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putchar('\b');
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break;
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case 'f':
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putchar('\f');
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break;
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case 'a':
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putchar('\a');
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break;
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case '"':
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putchar('"');
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break;
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case 'c':
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exit(EXIT_SUCCESS);
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default:
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putchar('\\');
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putchar(n);
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}
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}
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static void help(void) {
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printf("Usage printf FORMAT [ARG]...\n\n");
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printf("Format and print ARG(s) according to FORMAT (a-la C prinf)\n");
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}
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COMMAND(printf_main) {
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size_t index;
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int arg_index;
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char n, *arg;
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if (argc < 1) {
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global_help(help);
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return EXIT_SUCCESS;
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}
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parse_help(argc, argv, help);
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index = 0;
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arg_index = 0;
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while (true) {
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char c = argv[0][index];
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index++;
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if (c == '\0') break;
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if (c != '%' && c != '\\') {
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putchar(c);
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continue;
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}
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n = argv[0][index];
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index++;
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arg = NULL;
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if (arg_index < argc) {
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arg = argv[arg_index + 1];
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}
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if (c == '%') {
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handle_percent(n, arg);
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} else {
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handle_slash(n);
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}
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arg_index++;
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}
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return EXIT_SUCCESS;
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}
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