Search and Print all non-duplicate struct names inside input file - c

Question

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* Search and Print all non-duplicate struct names inside input file */
int main(int argc, char *argv[])
{
char temp[64], buf[64], filename[128], array[1024] = "";
char *ptr, *line = NULL;
char *tmp1, *tmp2;
ssize_t rv;
size_t len;
int count = 0;
FILE *fp;
if (argc < 2) {
printf("enter file name at cmd line...\n");
return -1;
}
sprintf(filename, argv[1], strlen(argv[1]));
fp = fopen(argv[1], "r");
if (!fp) {
printf("File could not be opened: %s\n", argv[1]);
return -1;
}
while ((rv = getline(&line, &len, fp)) != -1) {
ptr = strstr(line, "struct");
if (ptr) {
ptr += strlen("struct");
while (*ptr == ' ')
ptr++;
tmp1 = strchr(ptr, ' ');
tmp2 = strchr(ptr, ';');
len = 0;
if (tmp1 == NULL && tmp2 == NULL) {
continue;
}
else if (tmp1 == NULL && tmp2 != NULL) {
len = tmp2 - ptr;
}
else if (tmp1 != NULL && tmp2 == NULL) {
len = tmp1 - ptr;
}
else if (tmp1 && tmp2) {
len = tmp1 < tmp2 ? tmp1 - ptr : tmp2 - ptr;
}
if (len) {
snprintf(temp, len+1, "%s", ptr);
if (!strstr(array, temp)) {
sprintf(buf, "%2d. ", count++);
strcat(buf, temp);
strcat(array, buf);
strcat(array, "\n");
}
}
}
}
fclose(fp);
if (line)
free(line);
printf("%s\n", array);
return 0;
}
Above program finds struct names correctly, however I see chars like , and ) at the end of output names. How to remove it? Below is sample output:
[root#mnm-server programs]# ./a.out /usr/src/linux/drivers/net/ethernet/smsc/smsc911x.c
0. smsc911x_data
1. smsc911x_ops
2. smsc911x_platform_config
3. phy_device
4. mii_bus
5. net_device
6. napi_struct
7. regulator_bulk_data
8. clk
9. platform_device
10. smsc911x_data,
11. sk_buff
12. net_device_stats
13. netdev_hw_addr
14. sockaddr
15. ethtool_drvinfo
16. ethtool_eeprom
17. ethtool_ops
18. net_device_ops
19. ures,
20. resource
21. device_node
22. smsc911x_data))
23. dev_pm_ops
24. of_device_id
25. platform_driver
Notice output of line 10 and 22. One approach would be to do strchr for ,, ), ; and remove char from end. However, this is not a clean solution if the number of non-alphabetic characters increases.
NOTE: The best solution I found for this is here.

Answer 1

Thanks to inputs from Daniel Jour, the following code handles all cases of struct name* ptr;, struct name{ };, struct { };
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
/* Search and Print all non-duplicate struct names inside input file */
int main(int argc, char *argv[])
{
char temp[64], buf[64], filename[128], array[1024] = "";
char *ptr, *line = NULL;
size_t len;
int count = 0, flag = 0;
FILE *fp;
if (argc < 2) {
printf("enter file name at cmd line...\n");
return EXIT_FAILURE;
}
sprintf(filename, argv[1], strlen(argv[1]));
fp = fopen(argv[1], "r");
if (!fp) {
printf("File could not be opened: %s\n", argv[1]);
return EXIT_FAILURE;
}
while ((getline(&line, &len, fp)) != -1) {
ptr = flag ? line : strstr(line, "struct ");
if (ptr) {
if (!flag)
ptr += strlen("struct ");
while (*ptr == ' ')
ptr++;
len = 0;
while (isalnum(*ptr) || *ptr == '_' || *ptr == '{' || *ptr == '}') {
if (*ptr == '{') {
flag++;
}
else if (*ptr == '}') {
len = 0;
flag--;
do {
ptr++;
} while (*ptr == ' ');
ptr--;
}
else if ((*ptr != '{') || (*ptr != '}')) {
len++;
}
ptr++;
}
if (len && !flag) {
ptr -= len;
snprintf(temp, len+1, "%s", ptr);
if (!strstr(array, temp)) {
sprintf(buf, "%2d. ", count++);
strcat(buf, temp);
strcat(array, buf);
strcat(array, "\n");
}
}
}
}
fclose(fp);
if (line)
free(line);
printf("%s\n", array);
return EXIT_SUCCESS;
}
This program doesn't handle cases like func(struct x, struct y), interested users can fix it or just use grep -o "struct [^ ;,)]\+" # | awk '{print $2}' | sort -u. Output of the above program for pre-processed file hworld.i:
[root#server]# cat hworld.c
#include <stdio.h>
int main()
{
printf("hello world\n");
return 0;
}
[root#server]# gcc -Wall --save-temps hworld.c
[root#server]# ./find_structs hworld.i
0. _IO_FILE
1. _IO_marker
2. _IO_FILE_plus