64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
#include <stdio.h>
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/* compile with find-no-overflow.c or find-opt.c
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* gcc main.c [find-no-overflow.c | find-opt.c] */
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int find(char *pattern, char lineno_flag, char except_flag);
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#define ARG_FLAGS X('n', lineno) X('x', except)
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/* find pattern given by first arg in lines and print them
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* takes optional flags
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* -x : print all except matching
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* -n : print line numbers */
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int main(int argc, char *argv[])
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{
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int i;
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char c;
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/* declare flag variables */
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#define X(c, flag) char flag##_flag = 0;
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ARG_FLAGS
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#undef X
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char **parg = argv;
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/* parse flag arguments */
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for (i = 1; *++parg; ) {
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if (**parg != '-' || !(*parg)[1]) {
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argv[i++] = *parg;
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continue;
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}
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while (c = *++parg[0])
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switch (c) {
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#define X(C, flag) case C: flag##_flag = 1; break;
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ARG_FLAGS
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#undef X
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default:
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printf("error: illegal option -%c\n", c);
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argc = 0;
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break;
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}
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--argc;
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}
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/* illegal arguments */
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if (argc != 2) {
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printf("usage: find ");
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#define X(c, _) printf("[-%c] ", c);
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ARG_FLAGS
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#undef X
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printf("pattern\n");
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return -1;
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}
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char *pattern = argv[1];
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/* verify pattern */
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for (i = 0; (c = pattern[i]) != '\0'; i++)
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if (c == '\n') {
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printf("error: newline in pattern\n");
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return -2;
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}
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int found = find(pattern, lineno_flag, except_flag);
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return found;
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}
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