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annotate rcg.c @ 6:910e059abd6d

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rcg.c: fix bug with realloc()
author paulo@twcdns.fastsearch.net
date Tue, 06 Apr 2010 22:51:22 -0700
parents 26e28ec5fe87
children 0b9cf47655fe
rev   line source
pang@1 1 #include <stdio.h>
pang@1 2 #include <stdlib.h>
pang@1 3 #include <regex.h>
pang@1 4
pang@1 5 #define __USE_GNU
pang@1 6 #include <string.h>
pang@1 7
paulo@4 8 #include <unistd.h>
paulo@4 9
paulo@4 10 #define _GNU_SOURCE
paulo@4 11 #include <getopt.h>
paulo@4 12
pang@1 13 const size_t BUFSIZE = 5000;
pang@1 14
paulo@5 15 const char *CLR_START = "\x1B[31";
paulo@5 16 const char *CLR_END = "m";
paulo@5 17 const char *CLR_CLEAR = "\x1B[0m";
pang@1 18
paulo@4 19 typedef enum _exit_code {
paulo@4 20 EXIT_OK,
paulo@4 21 EXIT_REALLOC_ERROR,
paulo@4 22 EXIT_ARGS_ERROR,
paulo@4 23 } Exit_code;
paulo@4 24
paulo@3 25 int re_error(int errcode, const regex_t *re)
paulo@3 26 {
paulo@3 27 char *err_string = calloc(BUFSIZE, sizeof(char));
paulo@3 28 regerror(errcode, re, err_string, BUFSIZE*sizeof(char));
paulo@3 29 fprintf(stderr, "%s \n", err_string);
paulo@3 30 free(err_string);
paulo@3 31 return errcode;
paulo@3 32 }
paulo@3 33
paulo@4 34 Exit_code realloc_error()
paulo@3 35 {
paulo@3 36 fprintf(stderr, "realloc() failure \n");
paulo@4 37 return EXIT_REALLOC_ERROR;
paulo@4 38 }
paulo@4 39
paulo@4 40 Exit_code args_error()
paulo@4 41 {
paulo@4 42 fprintf(stderr, "Invalid or nonexistent argument. \n");
paulo@4 43 return EXIT_ARGS_ERROR;
paulo@4 44 }
paulo@4 45
paulo@4 46 // returns regular expression argument
paulo@4 47 char *parseArgs(int argc, char **argv)
paulo@4 48 {
paulo@4 49 static struct option long_options[] =
paulo@4 50 {
paulo@4 51 { 0, 0, 0, 0 },
paulo@4 52 };
paulo@4 53
paulo@4 54 int c;
paulo@4 55 int l;
paulo@4 56 while ((c = getopt_long(argc, argv, "", long_options, &l)) >= 0)
paulo@4 57 {
paulo@4 58 }
paulo@4 59
paulo@4 60 if (optind >= argc)
paulo@4 61 exit(args_error());
paulo@4 62
paulo@4 63 return argv[optind];
paulo@3 64 }
paulo@3 65
pang@1 66 int main(int argc, char **argv)
pang@1 67 {
paulo@4 68 char *re_expression = parseArgs(argc, argv);
paulo@4 69
paulo@5 70 //fprintf(stderr, "re_expression = %s \n", re_expression); //d/ 20100405 PBA
paulo@4 71
pang@1 72 char *buf = calloc(BUFSIZE, sizeof(char));
pang@1 73
paulo@3 74 int re_err;
pang@1 75 regex_t *re = calloc(1, sizeof(regex_t));
paulo@4 76 re_err = regcomp(re, re_expression, REG_EXTENDED);
paulo@3 77 if (re_err != 0)
paulo@3 78 exit(re_error(re_err, re));
pang@1 79
pang@2 80 regmatch_t *rem = calloc(1, sizeof(regmatch_t));
pang@1 81
pang@1 82 size_t CLR_START_len = strlen(CLR_START);
pang@1 83 size_t CLR_END_len = strlen(CLR_END);
paulo@5 84 size_t CLR_CLEAR_len = strlen(CLR_CLEAR);
pang@1 85
pang@1 86 while (fgets(buf, BUFSIZE, stdin))
pang@1 87 {
pang@2 88 int so = -1;
pang@2 89 int eo = -1;
pang@1 90
paulo@6 91 size_t out_len = strlen(buf) + 1;
paulo@3 92 char *out = calloc(out_len, sizeof(char));
paulo@3 93 unsigned int out_pos = 0;
paulo@3 94 unsigned int buf_pos = 0;
paulo@3 95
paulo@4 96 for (re_err = 0; re_err != REG_NOMATCH;)
pang@2 97 {
paulo@3 98 re_err = regexec(re, &buf[buf_pos], 1, rem, 0);
pang@1 99
paulo@3 100 //fprintf(stderr, "%s", &buf[buf_pos]); //d// 20100405 PBA
paulo@3 101
pang@2 102 if (out_len >= (BUFSIZE - buf_pos))
pang@2 103 out_len = (BUFSIZE - buf_pos) - 1;
pang@1 104
pang@2 105 so = rem[0].rm_so;
pang@2 106 eo = rem[0].rm_eo;
pang@1 107
paulo@3 108 //fprintf(stderr, "%d %d \n", so, eo); //d// 20100327 PBA
pang@1 109
paulo@3 110 if (re_err != REG_NOMATCH && so >= 0 && eo >= 0)
pang@1 111 {
pang@1 112 int match_len = eo - so;
paulo@5 113 out_len += CLR_START_len + CLR_END_len + CLR_CLEAR_len;
pang@1 114 out = (char *)realloc(out, out_len*sizeof(char));
paulo@3 115 if (!out)
paulo@3 116 exit(realloc_error());
paulo@3 117 strncpy(&out[out_pos], &buf[buf_pos], so);
paulo@3 118 out_pos += so;
paulo@3 119 buf_pos += so;
pang@1 120 strncpy(&out[out_pos], CLR_START, CLR_START_len);
pang@1 121 out_pos += CLR_START_len;
paulo@5 122 strncpy(&out[out_pos], CLR_END, CLR_END_len);
paulo@5 123 out_pos += CLR_END_len;
pang@2 124 strncpy(&out[out_pos], &buf[buf_pos], match_len);
pang@1 125 out_pos += match_len;
paulo@5 126 strncpy(&out[out_pos], CLR_CLEAR, CLR_CLEAR_len);
paulo@5 127 out_pos += CLR_CLEAR_len;
pang@2 128
pang@2 129 buf_pos += match_len;
pang@1 130 }
pang@2 131 else
paulo@5 132 {
paulo@3 133 strncpy(&out[out_pos], &buf[buf_pos], out_len - out_pos);
paulo@5 134 out[out_len] = '\0';
paulo@5 135 }
pang@1 136 }
pang@1 137
pang@1 138 fputs(out, stdout);
paulo@3 139 free(out);
pang@1 140 }
pang@1 141
paulo@4 142 return EXIT_OK;
pang@1 143 }