BSArch/01/prime.c

/* $Id: prime.c,v 1.15 2006/05/15 11:25:40 franky Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include <errno.h>

#ifdef _MSC_VER
#define snprintf _snprintf
#endif

#define BOOL int
#define TRUE 1
#define FALSE 0

#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)

#define MAX_LINE_LENGTH 80


/* check for prime number */
BOOL is_prime(long int number)
{
        int i,sq;
        /* negative values, 0 and 1 are never prime numbers */
        if (number < 2) return FALSE;
        sq=sqrt(number);
        
        /* check all numbers 2..sqrt(number) for being a prime number */
        for (i=2; i <= sq; i++) {
                if ((number % i) == 0)
                        return FALSE;
        }
        return TRUE;
}

/* convert from string to long int, with error checking */
long int convert_number(const char *nptr, BOOL warn) {
        
        char * endptr;
        long int number;

        errno = 0;
        number = strtol(nptr, &endptr, 10);
        
        /* invalid characters? */
        if (*endptr != '\0') {
                char message[256];
                snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
                if(warn) 
                        PRINTWARNING(message);
                else{
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        /* invalid range? */
        /* if (number == LONG_MAX || number == LONG_MIN) { */
        if (errno == ERANGE) {
                char message[256];
                snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
                if(warn)
                        PRINTWARNING(message);
                else{                   
                        PRINTERROR(message);
                        exit(EXIT_FAILURE);
                }
        }
        
        return number;
        
}

int main(int argc, char * argv[])
{
        
        if (argc == 1) {
                PRINTERROR("No arguments given.");
                exit(EXIT_FAILURE);
        }
        
        /* (3) range mode */
        if (argc > 2) {
                long int i, j;
                i = convert_number(argv[1],FALSE);
                j = convert_number(argv[2],FALSE);
                for (i; i< j; i++) {
                        PRINTPRIME(i);
                }
        
        /* other modes */
        } else {
                int err;
                /* try to open file for reading */
                FILE * fp = fopen(argv[1], "r");
                err=errno;
                /* (1) test-single-number mode: first argument is not a filename */
                if (fp == NULL) {
                        long int number = convert_number(argv[1],TRUE);
                        if(err){
                                fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
                                return -1;
                        }
                        PRINTPRIME(number);
                
                /* (2) file mode: read numbers from file */
                } else {
                        char line[MAX_LINE_LENGTH + 1];
                        long int number;
                        int line_length;
                        long int line_no = 0;
                        while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
                                
                                /* count line number (for warnings) */
                                line_no++;

                                line_length = strlen(line);
                                
                                /* skip empty lines */
                                if (strlen(line) < 2) continue;

                                /* line handling: policy = skip exceeding lines */
                                
                                /* line exceeds max length */
                                if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
                                        char message[254];
                                        snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
                                        PRINTWARNING(message);
                                        
                                        /* eat all characters until newline or EOF */
                                        while (1) {
                                                int charcode = fgetc(fp);
                                                if (charcode == 10 || charcode == EOF) break;
                                        }
                                        
                                        /* skip this line from prime calculation */
                                        continue;
                                }
                                
                                /* if last char is newline, strip it */
                                if (line[line_length-1] == '\n') {
                                        line[line_length-1] = '\0';
                                }
                                
                                /* finally: prime number calculation and output */
                                number = convert_number(line,FALSE);
                                PRINTPRIME(number);
                                
                        }
                        fclose(fp);
                }
        }
}
1	/* $Id: prime.c,v 1.15 2006/05/15 11:25:40 franky Exp $ */
2
3	#include <stdio.h>
4	#include <stdlib.h>
5	#include <math.h>
6	#include <limits.h>
7	#include <errno.h>
8
9	#ifdef _MSC_VER
10	#define snprintf _snprintf
11	#endif
12
13	#define BOOL int
14	#define TRUE 1
15	#define FALSE 0
16
17	#define PRINTPRIME(x) if (is_prime(x)) printf("%i\n", x)
18	#define PRINTERROR(message) fprintf(stderr, "ERROR: %s\n", message)
19	#define PRINTWARNING(message) fprintf(stderr, "WARNING: %s\n", message)
20
21	#define MAX_LINE_LENGTH 80
22
23
24	/* check for prime number */
25	BOOL is_prime(long int number)
26	{
27	int i,sq;
28	/* negative values, 0 and 1 are never prime numbers */
29	if (number < 2) return FALSE;
30	sq=sqrt(number);
31
32	/* check all numbers 2..sqrt(number) for being a prime number */
33	for (i=2; i <= sq; i++) {
34	if ((number % i) == 0)
35	return FALSE;
36	}
37	return TRUE;
38	}
39
40	/* convert from string to long int, with error checking */
41	long int convert_number(const char *nptr, BOOL warn) {
42
43	char * endptr;
44	long int number;
45
46	errno = 0;
47	number = strtol(nptr, &endptr, 10);
48
49	/* invalid characters? */
50	if (*endptr != '\0') {
51	char message[256];
52	snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
53	if(warn)
54	PRINTWARNING(message);
55	else{
56	PRINTERROR(message);
57	exit(EXIT_FAILURE);
58	}
59	}
60
61	/* invalid range? */
62	/* if (number == LONG_MAX \|\| number == LONG_MIN) { */
63	if (errno == ERANGE) {
64	char message[256];
65	snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
66	if(warn)
67	PRINTWARNING(message);
68	else{
69	PRINTERROR(message);
70	exit(EXIT_FAILURE);
71	}
72	}
73
74	return number;
75
76	}
77
78	int main(int argc, char * argv[])
79	{
80
81	if (argc == 1) {
82	PRINTERROR("No arguments given.");
83	exit(EXIT_FAILURE);
84	}
85
86	/* (3) range mode */
87	if (argc > 2) {
88	long int i, j;
89	i = convert_number(argv[1],FALSE);
90	j = convert_number(argv[2],FALSE);
91	for (i; i< j; i++) {
92	PRINTPRIME(i);
93	}
94
95	/* other modes */
96	} else {
97	int err;
98	/* try to open file for reading */
99	FILE * fp = fopen(argv[1], "r");
100	err=errno;
101	/* (1) test-single-number mode: first argument is not a filename */
102	if (fp == NULL) {
103	long int number = convert_number(argv[1],TRUE);
104	if(err){
105	fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
106	return -1;
107	}
108	PRINTPRIME(number);
109
110	/* (2) file mode: read numbers from file */
111	} else {
112	char line[MAX_LINE_LENGTH + 1];
113	long int number;
114	int line_length;
115	long int line_no = 0;
116	while (fgets(line, MAX_LINE_LENGTH + 1, fp)) {
117
118	/* count line number (for warnings) */
119	line_no++;
120
121	line_length = strlen(line);
122
123	/* skip empty lines */
124	if (strlen(line) < 2) continue;
125
126	/* line handling: policy = skip exceeding lines */
127
128	/* line exceeds max length */
129	if (line_length == MAX_LINE_LENGTH && line[line_length-1] != '\n') {
130	char message[254];
131	snprintf(message, 256, "Line too long (max %i chars) in line number: %i", MAX_LINE_LENGTH, line_no);
132	PRINTWARNING(message);
133
134	/* eat all characters until newline or EOF */
135	while (1) {
136	int charcode = fgetc(fp);
137	if (charcode == 10 \|\| charcode == EOF) break;
138	}
139
140	/* skip this line from prime calculation */
141	continue;
142	}
143
144	/* if last char is newline, strip it */
145	if (line[line_length-1] == '\n') {
146	line[line_length-1] = '\0';
147	}
148
149	/* finally: prime number calculation and output */
150	number = convert_number(line,FALSE);
151	PRINTPRIME(number);
152
153	}
154	fclose(fp);
155	}
156	}
157	}
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